A bit of crosswind lethal for rook (7)
I believe the answer is:
swindle
'rook' is the definition.
('swindle' can be a synonym of 'rook')
'a bit of crosswind lethal for' is the wordplay.
'a bit of' indicates the answer is hidden within the clue (I've seen 'a bit' mean this (the answer is formed by a bit of the clue)).
'SWINDLE' can be found hidden inside 'crosswind lethal for'.
(Other definitions for swindle that I've seen before include "Con, defraud" , "Cheat; fraud" , "Fraudulent scheme" , "Bilk" , "Scam" .)