Casualty or prey (6)
I believe the answer is:
victim
I believe this clue is a double definition.
'casualty' is the first definition.
(both can mean someone injured or killed)
'prey' is the second definition.
(I've seen this before)
(Other definitions for victim that I've seen before include "One made to suffer" , "Person harmed by another" , "Casualty, oppressed person" , "One harmed by crime" , "Object of attack" .)