Couple hired to form a band (8)
I believe the answer is:
bracelet
'a band' is the definition.
(I know that bracelet is a type of band)
'couple hired' is the wordplay.
'couple' becomes 'brace' (brace can mean a pair of something).
'hired' becomes 'let' (I've seen this before).
'brace'+'let'='BRACELET'
'to form' is the link.
(Other definitions for bracelet that I've seen before include "Ornament - handcuff (slang)" , "Arm jewellery" , "Ornamental wristband" , "Personal ornament" , "Let caber be made into a piece of jewellery" .)