Use, to get me back, a gambit (6)
I believe the answer is:
employ
'use' is the definition.
(synonyms)
'get me back a gambit' is the wordplay.
'get' means one lot of letters go next to another.
'back' says the letters should be written backwards.
'a gambit' becomes 'ploy' (synonyms).
'me' written backwards gives 'em'.
'em' put next to 'ploy' is 'EMPLOY'.
'to' is the link.
(Other definitions for employ that I've seen before include "Draw on" , "occupation" , "Give work to (someone)" , "Take on (staff)" , "Hire; use" .)