Crossword Genius

Mental flash (4)

Ross

I believe the answer is:

idea

'mental flash' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for idea that I've seen before include "Brainwave" , "Fancy" , "Flash of inspiration?" , "a wheeze" , "Inkling" .)

I've seen this clue in the Penny Press and the LA Times.
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