Crossword Genius

Bit of silliness (4)

Ross

I believe the answer is:

goof

(Other definitions for goof that I've seen before include "boob" , "(Make a) silly mistake" , "Blunder, mistake (slang)" , "In slang, bungle or blunder" , "Foolish mistake" .)

I've seen this clue in The New York Times.
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