Civil marriages, one might say? (6,9)

'civil marriages' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'one might say?' is the wordplay.
I cannot quite see how this works, but
'one' could be 'un' (northern English dialect form of 'one') and 'un' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?