Continental marriage? We're no longer in it (8,5)
I believe the answer is:
european union
'we're no longer in it' is the definition.
I can't judge whether this defines the answer.
'continental marriage?' is the wordplay.
'continental' becomes 'european' (I've seen this in another clue).
'marriage?' becomes 'union' (synonyms).
'european'+'union'='EUROPEAN UNION'
Can you help me to learn more?
(Other definitions for european union that I've seen before include "Political grouping" , "Political institution" , "National association" , "growing between Ireland and Poland?" , "EU in full" .)