Father to the French wife of a German husband? (4)

I believe the answer is:

frau

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'wife of a german husband?' is the definition.
'Frau' can be an answer for 'wife' (Frau is an example). I am unsure of the 'of a german husband?' bit.

'father to the french' is the wordplay.
'father' becomes 'fr' (abbreviation as in a priest's title).
'to the french' becomes 'au' ('to the' in French).
'fr'+'au'='FRAU'

Can you help me to learn more?

(Other definitions for frau that I've seen before include "German title for a woman" , "Wife abroad" , "German woman's title" , "Address for an adult German woman" , "Mrs in Germany" .)

I've seen this clue in The Globe and Mail.

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