Lovely rose without red exterior (5)

I believe the answer is:

belle

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'lovely' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for belle that I've seen before include "Handsome lady of the Ball?" , "Lovely girl" , "Beautiful woman - of the ball?" , "dish" , "Pretty girl" .)

I've seen this clue in The Independent.

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