Snooker rod (3)
I believe the answer is:
cue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snooker rod</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cue that I've seen before include "A snooker ball striker" , "Signal to begin - tapered stick" , "Actor's words" , "Actor's prompt" , "Hint on stage" .)