One Parisian cool and outstanding (11)

I believe the answer is:

uncollected

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'outstanding' is the definition.
Both the definition and answer are adjectives.
Perhaps there's an association between them I don't understand?

'one parisian cool' is the wordplay.
'one parisian' becomes 'un' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cool' becomes 'collected' (I've seen this in another clue).
'un'+'collected'='UNCOLLECTED'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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