Swindle a man on the board (4)
I believe the answer is:
rook
I believe this clue is a double definition.
'swindle' is the first definition.
(I know that swindle can be written as rook)
'a man on the board' is the second definition.
(type of piece or man in chess)
(Other definitions for rook that I've seen before include "Another name for castle in chess" , "Chess piece or crow" , "Swindle; castle" , "Man in game" , "man on board" .)