Someone capable of being prepossessing (10)

I believe the answer is:

personable

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'being prepossessing' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?

'someone capable' is the wordplay.
'someone' becomes 'person' (synonyms).
'capable' becomes 'able' (synonyms).
'person'+'able'='PERSONABLE'

'of' is the link.

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(Another definition for personable that I've seen is " Pleasant to be with".)

I've seen this clue in the Evening Standard.

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