Facial twitch (3)
I believe the answer is:
tic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">facial twitch</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tic that I've seen before include "Regular muscular twitch" , "Twitch in anticipation" , "Nervous movement" , "Facial muscle spasm" , "Convulsive twitching" .)