Bits of fluff (4)
I believe the answer is:
lint
'bits of fluff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lint that I've seen before include "Soft material for dressing wounds" , "Soft cloth for dressing wounds" , "Fabric for dressing wounds" , "Fabric for dressings" , "Wound-dressing fabric" .)