Tiny bites (4)
I believe the answer is:
'tiny bites' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for nips that I've seen before include "Pinches in a spin" , "Pinches - shots" , "Takes" , "Pinches as crab does" , "Pinches - in the bud?" .)