A Scot of the greatest urbanity (10)

I believe the answer is:

glaswegian

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'a scot' is the definition.
(I know that Glaswegian is a type of Scotchman)

I don't understand the rest of the clue.

(Other definitions for glaswegian that I've seen before include "Scot" , "Celt?" , "Scotsman" .)

I've seen this clue in The Globe and Mail.

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