Cue sport (7)
I believe the answer is:
snooker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cue sport</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 snooker that I've seen before include "Game played with 15 red balls, six of other colours and a white one" , "Cue sport" , "A form of pool" , "A percussion instrument" , "Game played on a billiards table" .)