Actor's signal (3)
I believe the answer is:
cue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">actor's signal</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 cue that I've seen before include "line in speech" , "Snooker rod" , "Signal (to actor)" , "Actor's signal" , "Hint on stage" .)