Crossword Genius

Brain wave (4)

Ross

I believe the answer is:

idea

'brain wave' 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 "Thought, conception" , "Suggestion" , "Content of cognition" , "Notion, image" , "Inkling" .)

I've seen this clue in the Penny Press, the LA Times and The New York Times.
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