Crossword Genius

Sudden bright idea (9)

Ross

I believe the answer is:

brainwave

'sudden bright idea' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for brainwave that I've seen before include "Sudden bright idea" , "Great idea" , "Good idea" .)

I've seen this clue in The Irish Times and The Telegraph.
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