Wedding ring (5)
I believe the answer is:
union
This clue is a double definition.
'wedding' is the first definition.
(thesaurus)
'ring' is the second definition.
(thesaurus)
(Other definitions for union that I've seen before include "Equity, perhaps" , "State of being joined together" , "Coupling, merger" , "Amalgamation" , "Alliance of workers" .)