Corner chess piece (4)
I believe the answer is:
rook
'corner chess piece' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rook that I've seen before include "Defraud -- crow" , "16" , "Chess piece also called castle" , "Ringing in the ears" , "man in marginalised position, initially" .)