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cloud of suspicion

A general sentiment of suspicion of wrongdoing or illegality. There's a cloud of suspicion in work after it came to light that someone has been stealing from the cash registers.
See also: cloud, of, suspicion

have a sneaking suspicion

To have a slight but persistent premonition or intuition (about something). Jimmy said he'd never be back, but I have a sneaking suspicion we'll see him again sooner or later.
See also: have, suspicion

above suspicion

Not suspected of any wrongdoing or crime. Because everyone thought he was such a good citizen, he remained above suspicion after the robbery.
See also: above, suspicion

under a cloud (of suspicion)

Viewed with distrust and/or thought to be dishonorable. Ever since that leak of private emails, everything the CEO has done has been under a cloud. As far as I'm concerned, the victim's husband is under a cloud of suspicion until we interrogate him.
See also: cloud

Caesar's wife must be above suspicion

If one is involved with a famous or prominent figure, one must avoid attracting negative attention or scrutiny. Julius Caesar allegedly used the phrase to explain why he divorced his wife, Pompeia. After my son's scandal derailed my presidential bid, I understood why Caesar's wife must be above suspicion.
See also: above, must, suspicion, wife

*above suspicion

[for one] to be honest enough that no one would suspect one; in a position where one could not be suspected. (This is a translation of words attributed to Julius Caesar, who divorced his wife, Pompeia, on the grounds of her possible involvement in a public scandal; Caesar stated, "Caesar's wife must be above suspicion.") (*Typically: be ~; keep oneself ~; remain ~.) The general is a fine old man, completely above suspicion.
See also: above, suspicion

Caesar's wife must be above suspicion.

Prov. The associates of public figures must not even be suspected of wrongdoing. (The ancient Roman Julius Caesar is supposed to have said this when asked why he divorced his wife, Pompeia. Because she was suspected of some wrongdoing, he could not associate with her anymore.) Jill: I don't think the mayor is trustworthy; his brother was charged with embezzlement. Jane: But the charges were never proved. Jill: That doesn't matter. Caesar's wife must be above suspicion. When the newspapers reported the rumor that the lieutenant governor had failed to pay his taxes, the governor forced him to resign, saying, "Caesar's wife must be above suspicion."
See also: above, must, suspicion, wife

above suspicion

So trustworthy as never to be suspected of wrongdoing, as in "The wife of Caesar must be above suspicion" (Charles Merivale, A History of the Romans under the Empire, 1850). The phrase was given further currency when it was used for the title of a very popular World War II spy film starring Joan Crawford ( Above Suspicion, 1943). A similar idiom using above in the sense of "beyond" is above the law, usually describing an individual or business behaving as though exempt from rules or laws that apply to others.
See also: above, suspicion

the ˌfinger of suˈspicion

if the finger of suspicion points or is pointed at somebody, they are suspected of having committed a crime, being responsible for something, etc: The woman’s still missing, and the finger of suspicion is now being pointed at her husband.
See also: finger, of, suspicion

be aˌbove/beˌyond suˈspicion

be so good or honest that nobody thinks you would do something bad: He is absolutely beyond suspicion.
See also: above, beyond, suspicion

be under suˈspicion (of something)

be the person that the police think has committed a crime (although they cannot prove it yet): He was still under suspicion and he knew the police were watching him.
See also: suspicion
References in classic literature ?
Is there nothing to justify suspicion in such circumstances as these--circumstances sworn to on the oaths of the witnesses?
There is nothing that can compromise him in any way, since it is Miss Howard who has the strychnine, which, after all, is only wanted as a blind to throw suspicion on John Cavendish.
He was already under suspicion, and by making 190> the matter public I secured the services of about ten amateur detectives, who would be watching him unceasingly, and being himself aware of their watchfulness he would not dare seek further to destroy the document.
He's a very cunning man, and a similar trick had often enabled him to turn suspicion from himself.
Enough of suspicion attaches to him to--no, I think I would not say so, generally.
I hope you do not object, sir, to my having stated in public, emphatically, that he will reappear here, whenever any new suspicion may be awakened, or any new circumstance may come to light in this extraordinary matter?
Nothing clings like a suspicion in the mind of a conscientious young man that he has been allowing his heart to stray from its proper anchorage.
Franklin Blake hasn't got a suspicion of the girl's fancy for him?
Well, Betteredge," he said, "how does the atmosphere of mystery and suspicion in which we are all living now, agree with you?
The better I know it to be so believed there, my dear,' said Rachael, 'and the kinder I feel it that you come away from there, purposely to comfort me, and keep me company, and be seen wi' me when I am not yet free from all suspicion myself, the more grieved I am that I should ever have spoken those mistrusting words to the young lady.
Louisa had never spoken of harbouring any suspicion of her brother in connexion with the robbery, she and Sissy had held no confidence on the subject, save in that one interchange of looks when the unconscious father rested his gray head on his hand; but it was understood between them, and they both knew it.
No, but I repeat it was one of them who lighted the general and this gentleman to the abbey, and Digby assures us that the general had strong suspicions concerning those people.
She told me she was a clergyman's daughter, and had been left an orphan from her childhood, but had had the good fortune to obtain a situation in a very pious family; and then she spoke so gratefully of the kindness she had experienced from its different members, that I reproached myself for my uncharitable thoughts and unfriendly conduct, and relented for a time, but not for long: my causes of dislike were too rational, my suspicions too well founded for that; and I knew it was my duty to watch and scrutinize till those suspicions were either satisfactorily removed or confirmed.
I did not mention my suspicions to Rachel; but she, having sojourned for half a century in this land of sin and sorrow, has learned to be suspicious herself.
At that moment, when the revelation of everything was hanging over him, there was nothing he expected so much as that she would answer mockingly as before that his suspicions were absurd and utterly groundless.