Crossword Genius

Foolish (4)

Ross

'foolish' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for gaga that I've seen before include "Slangily crazy or senile" , "US singer Lady ___" , "In repetitive slang, senile or crazy" , "crackers" , "Lady who sings" .)

I've seen this clue in the Penny Press, the Evening Standard, the King Feature Syndicate, The Mirror and The Star Tribune.
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