Crossword Genius

Astronomical spoils! (4)

Ross

I believe the answer is:

mars

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'spoils' is the definition.
('mar' can be a synonym of 'spoil')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for mars that I've seen before include "Possibly pollutes" , "Holst's Bringer of War" , "Ruins" , "part of suite" , "world" .)

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