Exhorts, in French, to marry son (7)

I believe the answer is:

enjoins

'exhorts' is the definition.
(both can mean encourages)

'in french to marry son' is the wordplay.
'in french' becomes 'en' ('in' in French).
'to marry' becomes 'join'.
'son' becomes 's' (genealogical abbreviation for son).
'en'+'join'+'s'='ENJOINS'

I've seen this clue in The Times.

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