God spoils planet (4)
I believe the answer is:
mars
This clue is a triple definition!
'god' is the first definition.
(Mars is an example)
'spoils' is the second definition.
('mar' can be a synonym of 'spoil')
'planet' is the third definition.
(Mars is a planet)
(Other definitions for mars that I've seen before include "Famous Texas mission" , "Red planet and god of war" , "RS [RED STAR] (not technically)" , "Where Beagle 2 was landed on 25 December 2003" , "bar....that's sweet!" .)