One eating own species (8)
I believe the answer is:
cannibal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one eating own species</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cannibal that I've seen before include "Eater of one's own kind" , "One eating own species" , "Anthropophagite" , "One who eats its own species" , "Person eating human flesh" .)