Possible Clues:

• Tarred like merchant
• In business one might turn the colourful painting over
• Western movie entrepreneur
• One's business is to get up one's ruddy craft
• Does the ruddy painting turn up at 10 across?
• One is back about the point of it in business
• Dealer putting up crimson paintings?
• Is it his business to be able to make things dear inside?
• Is it his business to turn red with craftiness?
• Dealer returning paintings from Moscow?