She's the one with Margaret (5)

I believe the answer is:

megan

'she's' is the definition.

'one with margaret' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'with' means one lot of letters go next to another.
'margaret' becomes 'Meg' (short for Margaret).
'an' after 'meg' is 'MEGAN'.

'the' acts as a link.

I've seen this clue in the Evening Standard.

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