Slightly urbane? (6)

I believe the answer is:

svelte

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'urbane?' is the definition.
('svelte' can be a synonym of 'urbane')

I cannot understand how the remainder of the clue works.

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(Other definitions for svelte that I've seen before include "Elegant and of slender build" , "Slim and attractive" , "free" , "Slim and elegant" , "Slender or sleek" .)

I've seen this clue in the Evening Standard.

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