Pair allowed to form band (8)
I believe the answer is:
bracelet
'band' is the definition.
(I know that bracelet is a type of band)
'pair allowed' is the wordplay.
'pair' becomes 'brace' (synonyms).
'allowed' becomes 'let' (to let is to allow or permit).
'brace'+'let'='BRACELET'
'to form' acts as a link.
(Other definitions for bracelet that I've seen before include "Ornamental band worn on wrist" , "Arm band" , "Jewellery worn around the wrist" , "Let caber be made into a piece of jewellery" , "Item of jewellery on wrist" .)