Snooker shot (2-3)
I believe the answer is:
in-off
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snooker shot</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for in-off that I've seen before include "Losing hazard at billiards" , "Billiards/snooker shot" , "Pocketing of a snooker ball via a deflection" , "Glancing billiards pot" , "Error in game" .)