Beautiful flier, outside left again

I believe the answer is:

belle

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'beautiful flier' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?

I don't understand the remainder of the clue.

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(Other definitions for belle that I've seen before include "Attractive woman" , "Beautiful girl" , "Pretty girl" , "-- Epoque, before the Great War" , "Handsome lady of the Ball?" .)

I've seen this clue in the Evening Standard.

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