Leave a bit (4)
I believe the answer is:
part
This clue is a double definition.
'leave' is the first definition.
(parting is a kind of leaving)
'a bit' is the second definition.
(I've seen this before)
(Other definitions for part that I've seen before include "Region" , "unemployed actor hopes for" , "Some; break" , "Separate - role" , "Some - theatrical role" .)