First X or O (3)
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" .)