Cleaner parasite (6)
I believe the answer is:
sponge
I believe this is a double definition.
'cleaner' is the first definition.
'parasite' is the second definition.
(term for someone getting something from others)
(Other definitions for sponge that I've seen before include "Cadge; type of cake" , "Ask for money" , "Light cake; sea creature" , "drunkard or > hanger-on" , "Absorbing" .)