One French mother's royal identity revelation (9)

I believe the answer is:

unmasking

I'm a little stuck... Click here to teach me more about this clue!

'identity revelation' is the definition.
'unmasking' can be an answer for 'revelation' (unmasking is a kind of revelation). I'm not certain of the 'identity' bit.

'one french mother's royal' is the wordplay.
'one french' becomes 'un' ('one' in French).
'mother's' becomes 'ma's' (Ma is another word for mother or mum).
'royal' becomes 'king' (a king is royal).
'un'+'mas'+'king'='UNMASKING'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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