Dealer rejected Soviet paintings? (6)
I believe the answer is:
trader
'dealer' is the definition.
(I know that dealer can be written as Trader)
'rejected soviet paintings?' is the wordplay.
'rejected' says the letters should be written in reverse.
'soviet' becomes 'red' (red can informally mean communist).
'paintings?' becomes 'art' (painting is an art).
'red'+'art'='redart'
'redart' back-to-front is 'TRADER'.
(Other definitions for trader that I've seen before include "Merchant ship; dealer" , "Dealer who buys and sells" , "Retard (anag.)" , "One selling" , "One buys and sells" .)