Wonderfully skilled peacekeepers preserve city (7)

I believe the answer is:

uncanny

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

'wonderfully skilled' is the definition.
I can't tell whether this defines the answer.

'peacekeepers preserve city' is the wordplay.
'peacekeepers' becomes 'un'.
'preserve' becomes 'can' (canning is a kind of preserving).
'city' becomes 'ny' (short for New York).
'un'+'can'+'ny'='UNCANNY'

Can you help me to learn more?

(Other definitions for uncanny that I've seen before include "Weird, unearthly" , "Strange and unnatural" , "Incredible" , "Weird; supernatural" , "Extraordinary - strange" .)

I've seen this clue in The Independent.

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