Unusually debonair, one northerner (10)

I believe the answer is:

aberdonian

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'northerner' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'unusually debonair one' is the wordplay.
'unusually' indicates anagramming the letters.
'one' becomes 'an' (I've seen this in other clues).
'debonair' with letters rearranged gives 'aberdoni'.
'aberdoni'+'an'='ABERDONIAN'

Can you help me to learn more?

(Other definitions for aberdonian that I've seen before include "of Scottish city" , "Scottish resident" , "Citizen of Aberdeen" , "person from 20 [GRANITE] city" .)

I've seen this clue in The Independent.

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