Crossword Genius

First X or O (3)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">first x or o</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Newsday and The New York Times.
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