Seaside town churchgoer winning trophy (5,3)
I believe the answer is:
ryder cup
'trophy' is the definition.
(I've seen this before)
'seaside town churchgoer winning' is the wordplay.
'seaside town' becomes 'ryde' (I've seen this before).
'churchgoer' becomes 'rc' (abbreviation for Roman Catholic).
'winning' becomes 'up' (eg being up at half time in football).
'ryde'+'rc'+'up'='RYDER CUP'
(Other definitions for ryder cup that I've seen before include "Golfing contest" , "sporting contest" , "US-Europe golf event" , "Prize for golfers" , "Biennial international golf tournament" .)