A girl to hang on to? (3)

I believe the answer is:

peg

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'a girl' is the definition.

I don't understand the rest of the clue.

(Other definitions for peg that I've seen before include "Wire tensioner" , "This leg is artificial" , "Limit" , "Short pin or bolt" , "Clothes line pin" .)

I've seen this clue in The Globe and Mail, the Evening Standard and The Irish Independent.

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