Bloodsucker, sponger (8)
I believe the answer is:
parasite
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">bloodsucker</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">sponger</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that sponger can be written as parasite)</span><br/ ><br/ ></span>
(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" .)