Scrounger (8)
I believe the answer is:
parasite
'scrounger' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for parasite that I've seen before include "sponge" , "Twenty five dn [LEECH]" , "mistletoe sprig can be" , "Animal or plant that lives off another" , "Say mistletoe" .)