Handy dexterity! (7)
I believe the answer is:
sleight
'dexterity' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for sleight that I've seen before include "Conjuror uses this" , "Hits leg (anag) - cunning" , "Artful trick" , "Trickery" , "craft" .)