Couple departed having removed fine jewellery item (8)
I believe the answer is:
bracelet
'jewellery item' is the definition.
(I've seen this before)
'couple departed having removed fine' is the wordplay.
'couple' becomes 'brace' (brace can mean a pair of something).
'departed' becomes 'left' (to leave is to depart).
'having removed' is a deletion indicator.
'fine' becomes 'f' (abbreviation e.g. condition of old coins, books).
'left' with 'f' removed is 'let'.
'brace'+'let'='BRACELET'
(Other definitions for bracelet that I've seen before include "Personal ornament" , "Jewellery worn around the wrist" , "charm?" , "Band around the wrist" , "Item of jewellery found in Crete lab" .)