Bloodsucker, sponger (8)
I believe the answer is:
parasite
I believe this clue is a double definition.
'bloodsucker' is the first definition.
(thesaurus)
'sponger' is the second definition.
(I know that sponger can be written as parasite)
(Other definitions for parasite that I've seen before include "host has to put up with" , "Possibly tick" , "Animal or plant that lives off another" , "freeloader?" , "mistletoe sprig can be" .)