If wrong again, she's probably French (4)

I believe the answer is:

fifi

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'she's probably french' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'if wrong again' is the wordplay.
'wrong' indicates anagramming the letters.
'again' becomes 'fi' (I can't justify this - if you can you should give a lot more credence to this answer).
'if' anagrammed gives 'fi'.
'fi'+'fi'='FIFI'

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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