Vendors holding twice the cash as prophets (7)
I believe the answer is:
sellers
'vendors' is the definition.
('seller' can be a synonym of 'vendor')
'holding twice the cash as prophets' is the wordplay.
'holding' indicates putting letters inside.
'twice' indicates the doubling of some letters.
'the cash as' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'prophets' becomes 'seers' (I've seen this before).
'l' duplicated is 'll'.
'll' placed within 'seers' is 'SELLERS'.
Can you help me to learn more?
(Other definitions for sellers that I've seen before include "Peter" , "Vendors" , "British actor, star of the 17" , "kind of market" .)