Crossword Genius

First X or O (3)

Ross

I believe the answer is:

'first x or o' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tic that I've seen before include "Regular muscular twitch" , "Nervous twitch" , "Convulsive twitch (of face)" , "Muscle twitch" , "Facial muscle spasm" .)

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