Spoils for the god 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')
'the god of war' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for mars that I've seen before include "Fourth planet from the Sun" , "Ruins" , "Red planet and god of war" , "Spoils - heavenly body" , "Damages - planet" .)