Crossword Genius

Ruins something heavenly (4)

Ross

I believe the answer is:

mars

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'ruins' is the definition.
(to mar is to ruin or spoil)

I can't explain the remainder of the clue.

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(Other definitions for mars that I've seen before include "Fourth rock from the Sun" , "Fourth planet from the Sun" , "Holst's Bringer of War" , "Roman war god; planet" , "Ruins" .)

I've seen this clue in the Evening Standard.
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