Go off to get married in ceremony (4)
I believe the answer is:
pomp
'ceremony' is the definition.
(thesaurus)
'go off to get married' is the wordplay.
'go off' becomes 'pop'.
'to get' means one lot of letters goes inside another.
'married' becomes 'm'.
'pop' placed around 'm' is 'POMP'.
'in' is the link.
(Other definitions for pomp that I've seen before include "Great show" , "Boastful display" , "Ceremoniousness" , "Ceremony and splendour" , "Ostentation - vanity" .)