Trick to get bit back (4)
I believe the answer is:
trap
'trick' is the definition.
(I've seen this before)
'bit back' is the wordplay.
'bit' becomes 'part' (I've seen this in other clues).
'back' shows that the letters should be reversed in order.
'part' back-to-front is 'TRAP'.
'to get' is the link.
(Other definitions for trap that I've seen before include "Golfing hazard" , "Deceive" , "Means of transport (sometime sprung!)" , "Part of a snare" , "Ambush" .)