Castle-shaped chess piece (4)
I believe the answer is:
rook
'castle-shaped 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 "Chesspiece otherwise known as a castle" , "Poignant, evocative" , "Chess piece or crow" , "Swindle (colloq.); bird" , "Swindle; castle" .)