Everyone at home welcoming a church wedding (8)
I believe the answer is:
alliance
'wedding' is the definition.
(thesaurus)
'everyone at home welcoming a church' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'church' becomes 'ce' (abbreviation for Church of England).
'in' going around 'a' is 'ian'.
'all'+'ian'+'ce'='ALLIANCE'
(Other definitions for alliance that I've seen before include "League - treaty" , "Coalition or union" , "Bond" , "Marriage - union" , "Confederation" .)