Sweeper's light touch (5)
I believe the answer is:
brush
I believe this is a double definition.
'sweeper's' is the first definition.
(something which sweeps)
'light touch' is the second definition.
(synonyms)
(Other definitions for brush that I've seen before include "Undergrowth, fox tail" , "Sweeping implement" , "Slight touch; fox's tail" , "Tool for cleaning or painting" , "Sweep" .)