Tosca might feature such trickery (4)
I believe the answer is:
scam
'trickery' is the definition.
(I've seen this in another clue)
'tosca might feature' is the wordplay.
'feature' says the answer is hidden in the clue (I've seen 'featuring' mean this).
'SCAM' is hidden in the letters of 'tosca might'.
'such' acts as a link.
(Other definitions for scam that I've seen before include "rook" , "Fraud, trick (slang)" , "Fraudulent action" , "Dubious operation" , "Fraudulent trick or swindle" .)