Spoils of war? (4)
I believe the answer is:
mars
This clue is a double definition.
'spoils' is the first definition.
('mar' can be a synonym of 'spoil')
'war?' is the second definition.
(I've seen this before)
'of' acts as a 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" .)