Crossword Genius

Enchanting twins come to disavow origins? (7)

Ross

I believe the answer is:

winsome

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'enchanting' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for winsome that I've seen before include "Charming (in a childlike way?)" , "Holding an appeal" , "Charming, engaging" , "Attractive - I'm so new (anag)" , "Pleasant" .)

I've seen this clue in The Times.
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