Supporter church allowed wrist ornament (8)
I believe the answer is:
bracelet
'wrist ornament' is the definition.
(I've seen this in another clue)
'supporter church allowed' is the wordplay.
'supporter' becomes 'bra' (a bra gives support to breasts).
'church' becomes 'CE' (Church of England).
'allowed' becomes 'let' (to let is to allow or permit).
'bra'+'ce'+'let'='BRACELET'
(Other definitions for bracelet that I've seen before include "Wrist, arm adornment" , "Arm band" , "Jewellery worn around the wrist" , "Might Bel react badly to this jewellery?" , "Item of jewellery found in Crete lab" .)