Mono version of something in the sky (4)

I believe the answer is:

moon

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

'something in the sky' is the definition.
I can't tell whether this defines the answer.

'mono version' is the wordplay.
'version' indicates an anagram.
'mono' with letters rearranged gives 'MOON'.

'of' is the link.

Can you help me to learn more?

(Other definitions for moon that I've seen before include "Natural satellite of a planet" , "Remove boxers, maybe" , "Earthly satellite" , "Shining ball of green cheese?" , "Show Bottom!" .)

I've seen this clue in The Mirror.

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