Pinch fastener that's brought back (3)
I believe the answer is:
nip
'pinch' is the definition.
(nip can mean to pinch or bite)
'fastener that's brought back' is the wordplay.
'fastener' becomes 'pin' (pin is a kind of fastener).
'that's brought back' is a reversal indicator.
'pin' written backwards gives 'NIP'.
(Other definitions for nip that I've seen before include "Pinch; drink of spirits" , "(Give) a small sharp bite" , "Pinch with small drink" , "Small drink of spirits" , "Feeling cold" .)