Crossword Genius

Sudden bright idea (9)

Ross

I believe the answer is:

brainwave

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden bright idea</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

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

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