Top chess player (11)
I believe the answer is:
grandmaster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">top chess player</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 grandmaster that I've seen before include "expert at playing pieces" , "a wizard with his pieces?" , "Expert on board" , "Chess player of the highest class" , "A top chess player" .)