Brainwave (4)

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5,4 6,4

idea

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

This is all the clue.

(Other definitions for idea that I've seen before include "Clue" , "Theory" , "Thought, belief" , "Something imagined in the mind" , "Notion, belief" .)

I've seen this clue in The Sun and The Guardian.

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