The wrong party piece for a girl (5)

I believe the answer is:

hetty

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'a girl' is the definition.

'the wrong party piece' is the wordplay.
'wrong' is an anagram indicator.
'party piece' becomes 'ty' (I can't explain this - if you can you should believe this answer much more).
'the' anagrammed gives 'het'.
'het'+'ty'='HETTY'

'for' acts as a link.

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I've seen this clue in the Evening Standard.

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