Bum cleaner (6)
I believe the answer is:
sponge
I believe this clue is a double definition.
'bum' is the first definition.
(take money from someone without reciprocating)
'cleaner' is the second definition.
(Other definitions for sponge that I've seen before include "Soft, absorbent material used for washing" , "Porous substance to soak up" , "Scrounge; wiper" , "clean with damp cloth" , "drunkard or > hanger-on" .)