Married, surrounded by champagne? Splendid stuff (4)
I believe the answer is:
pomp
'splendid stuff' is the definition.
'married surrounded by champagne?' is the wordplay.
'married' becomes 'm'.
'surrounded by' indicates putting letters inside.
'champagne?' becomes 'pop'.
'm' going within 'pop' is 'POMP'.
(Other definitions for pomp that I've seen before include "Ceremoniousness" , "Ostentatious ceremony" , "Ceremony and splendour" , "Vain display" , "Ceremony or ostentation" .)