Dryer buildup (4)
I believe the answer is:
lint
'dryer buildup' 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 "Fabric for dressing wounds" , "Absorbent material for dressing wounds" , "Wound dressing" , "Soft cloth for dressing wounds" , "Soft material for dressing wounds" .)