Crossword Genius

Impairs the perfection of the planet (4)

Ross

I believe the answer is:

mars

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'impairs' is the first definition.
('mar' can be a synonym of 'impair')

'perfection of the planet' is the second definition.
'Mars' can be an answer for 'planet' (Mars is a planet). I am not sure about the 'perfection of the' bit.

'the' is the link.

Can you help me to learn more?

(Other definitions for mars that I've seen before include "bar....that's sweet!" , "classical god" , "Famous Texas mission" , "Possibly pollutes" , "Next planet out" .)

I've seen this clue in The Irish Independent.
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