A role's changed - go back to retailer's arrangement (4,2,6)
I believe the answer is:
sale or return
'retailer's arrangement' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'a role's changed go back' is the wordplay.
'changed' indicates anagramming the letters.
'go back' becomes 'return' (synonyms).
'a'+'roles'='aroles'
'aroles' is an anagram of 'saleor'.
'saleor'+'return'='SALE OR RETURN'
'to' is the link.
Can you help me to learn more?
(Other definitions for sale or return that I've seen before include "Marketing arrangement" , "Arrangement between vendor and supplier" .)