Legerdemain (7,2,4)
I believe the answer is:
sleight of hand
'legerdemain' is the definition.
(sleight of hand is a kind of legerdemain)
This is the entire clue.
(Other definitions for sleight of hand that I've seen before include "Doctor or student doctor" , "Manual dexterity in conjuring" , "Trickery" , "Skilful deception" , "Prestidigitation" .)