Jimmy White's white? (3,4)
I believe the answer is:
cue ball
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jimmy white's white?</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 ball that I've seen before include "The white in snooker" , "Feature of pub entertainment" , "Object struck by a snooker player" , "Jimmy White's white?" .)