An ornamental clasp and two rings found in a British Church (6)
I believe the answer is:
brooch
'an ornamental clasp' is the definition.
(I've seen this before)
'two rings found in a british church' is the wordplay.
'two rings' becomes 'oo'.
'found in' is an insertion indicator.
'a british' becomes 'br' (abbreviation for British).
'church' becomes 'ch' (common abbreviation).
'br'+'ch'='brch'
'oo' inserted within 'brch' is 'BROOCH'.
'and' acts as a link.
(Other definitions for brooch that I've seen before include "Decorative clasp" , "Ornament with a hinged pin and catch" , "Jewellery item with pin" , "Decorative pin" , "Ornament worn fastened to clothing" .)