Possible Clues:

• Knotty dual in Ron
• Having small lumps
• Our land is cultivated but lumpy
• Like knots swirling around across lake
• 'Do come back in a lunar setting, Nobby (7)'
• Occurring in small knots
• Lumpy with nearly all round effect
• Managed to control board game set up -- it's gnarly
• Mafia type goes back to college? A first reaction - that's how one describes a right lump!
• Having small swellings