not a glimmer
not a glimmer (of something)
Not even the smallest amount (of something). The group of financial analysts said there is not a glimmer of hope that the economy will improve at any point this year. The team needed to come out with intensity if they wanted to stand a chance, but unfortunately they showed not a glimmer during that dreadful display. There wasn't a glimmer of remorse in his voice as he pleaded guilty to the horrible crimes.
not a glimmer (of an idea)and not a clue
Fig. no idea. A: Where's the subway? B: Sorry. Not a glimmer of an idea. How long till we're there? Not a clue.