Possible Clues:

• Crystalline type of brown sugar
• Sugar which shares its name with a river in Guyana
• An unusually good medical brought up sugar - and alcohol
• Rum and mead, rare mixture
• Sugar
• River in tribal territory two artists depicted
• The editor returns with me and a couple of artists to make it all sweet and dark (8)
• Knock back a Red Sea of rum
• Source of sweetness to excite a dreamer
• A dreamer can be really sweet!