Resells quickly to vendors (7)
I believe the answer is:
sellers
'vendors' is the definition.
('seller' can be a synonym of 'vendor')
'resells quickly' is the wordplay.
'resells' anagrams to 'SELLERS'.
However, I am unsure how this is indicated.
'to' is the link.
Can you help me to learn more?
(Other definitions for sellers that I've seen before include "British actor, star of the 17" , "Peter" , "Vendors" , "kind of market" .)