One eating own species (8)
I believe the answer is:
cannibal
'one eating own species' is the definition.
(I've seen this before)
This is all the clue.
(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" .)