Trainee in time for some fluff (4)
I believe the answer is:
lint
'some fluff' is the definition.
(I've seen this in another clue)
'trainee in time' is the wordplay.
'trainee' becomes 'l' ().
'time' becomes 't' (abbreviation).
'l'+'in'+'t'='LINT'
'for' is the link.
(Other definitions for lint that I've seen before include "Absorbent material for dressing wounds" , "Fabric for dressings" , "Napped cloth used to dress wounds" , "Soft cloth for dressing wounds" , "Wound dressing" .)