not have a clue

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not have a clue

also without a clue
to have no knowledge or information about something The guy doesn't have a clue what forestry is all about.
Usage notes: sometimes used in the form have a clue: Before most doctors have a clue about what a new drug can do, it's being sold to the public.
See also: clue, have, not

not have a clue

Have no idea or inkling about something, as in Jane doesn't have a clue as to why John won't call her, or Do you know what's wrong with the boiler?-No, I haven't a clue. This usage was first recorded in 1928.
See also: clue, have, not
References in classic literature ?
Thus Hester Prynne, whose heart had lost its regular and healthy throb, wandered without a clue in the dark labyrinth of mind; now turned aside by an insurmountable precipice; now starting back from a deep chasm.
However, if one designs to construct a dwelling-house, it behooves him to exercise a little Yankee shrewdness, lest after all he find himself in a workhouse, a labyrinth without a clue, a museum, an almshouse, a prison, or a splendid mausoleum instead.
A completeness without a clue, and a stealthy silence as of a neatly executed crime, characterise this murderous disaster, which, as you may remem- ber, had its gruesome celebrity.