Couple allowed to make wrist ornament (8)
I believe the answer is:
bracelet
'wrist ornament' is the definition.
(I've seen this in another clue)
'couple allowed to' is the wordplay.
'couple' becomes 'brace' (brace can mean a pair of something).
'allowed to' becomes 'let' (to let something happen is to allow it).
'brace'+'let'='BRACELET'
'make' is the link.
(Other definitions for bracelet that I've seen before include "Wrist, arm adornment" , "Ornamental wristband" , "Arm jewellery" , "16 [ADORNMENT]" , "Item of jewellery found in Crete lab" .)