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Oddly, finer dress stores maintain no returns policy (7,7)

Ross

I believe the answer is:

finders keepers

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

'oddly finer dress stores' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'maintain no returns policy' is the wordplay.
I cannot really see how this works, but
'maintain' could be 'keep' (synonyms) and 'keep' is found in the answer.
'no' could be 'n' (common abbreviation y/n) and 'n' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for finders keepers that I've seen is " Justification for holding on to something discovered".)

I've seen this clue in The Times.
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