Crossword Genius

Twirling one's hair, e.g. (3)

Ross

I believe the answer is:

tic

(Other definitions for tic that I've seen before include "Nervous movement" , "Minor muscle spasm" , "Nervous habit" , "Spasmodic muscular twitch" , "Nervous response" .)

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