First homicide victim (4)
I believe the answer is:
abel
'first homicide victim' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abel that I've seen before include "Cain's 11" , "Adam's boy" , "Cain's victim; - Magwitch (Great Expectations)" , "Bale out with murder victim" , "Victim of murderer" .)