Crossword Genius

First of three O's (3)

Ross

I believe the answer is:

tic

(Other definitions for tic that I've seen before include "Localised habitual twitch, especially to the face" , "Convulsive spasm" , "Muscle twitch" , "Regular muscular twitch" , "Facial movement" .)

I've seen this clue in the LA Times.
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