Castle in chess (4)
I believe the answer is:
rook
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">castle in chess</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 rook that I've seen before include "Steal - castle" , "Defraud; bird; chessman" , "Ringing in the ears" , "Swindle; castle" , "Defraud -- crow" .)