Spoils of war? (4)
I believe the answer is:
mars
I believe this clue is a double definition.
'spoils' is the first definition.
(I know this)
'war?' is the second definition.
(I know that Ares can be written as Mars)
'of' is the link.
(Other definitions for mars that I've seen before include "Spoils - planet" , "Fourth planet from the Sun" , "March to the French" , "Roman war god; planet" , "part of suite" .)