Cut off or pins back (4)
I believe the answer is:
snip
'cut off' is the definition.
(I've seen this in another clue)
'pins back' is the wordplay.
'back' shows that the letters should be reversed in order.
'pins' reversed gives 'SNIP'.
'or' is the link.
(Other definitions for snip that I've seen before include "Bargain - crop" , "Cut - price bargain" , "Cut with shears" , "Cut with scissors in small strokes" , "Cut; bargain (colloq.)" .)