Couple with permit for piece of jewellery (8)
I believe the answer is:
bracelet
'piece of jewellery' is the definition.
(I've seen this before)
'couple with permit' is the wordplay.
'couple' becomes 'brace' (synonyms).
'with' says to put letters next to each other.
'permit' becomes 'let' (synonyms).
'brace'+'let'='BRACELET'
'for' is the link.
(Other definitions for bracelet that I've seen before include "Jewellery -- clear bet (anag)" , "Personal ornament" , "Ornament worn on arm or wrist" , "Rebel cat (anag.)" , "charm?" .)