The god of war’s spoils? (4)
I believe the answer is:
I believe this clue is a double definition.
'the god of war's' is the first definition.
(I've seen this in another clue)
'spoils?' is the second definition.
(I know this)
(Other definitions for mars that I've seen before include "Damages - planet" , "Fourth rock from the Sun" , "Roman war god; planet" , "one associated with war" , "March to the French" .)