Joint business rebranded Schubert (8)
I believe the answer is:
butchers
'joint business' is the definition.
(joints are types of meat)
'rebranded schubert' is the wordplay.
'rebranded' indicates an anagram.
'schubert' anagrammed gives 'BUTCHERS'.
(Other definitions for butchers that I've seen before include "Abbreviated rhyming slang for 'look'" , "Sellers of meat (look!)" , "Look (slang) - Smithfield Market workers" , "Cutters and sellers of meat" , "They prepare and/or sell meat" .)