Castle in chess (4)
I believe the answer is:
rook
'castle in chess' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rook that I've seen before include "Steal - castle" , "Defraud; bird; chessman" , "Ringing in the ears" , "Swindle; castle" , "Defraud -- crow" .)