Possible Clues:

• One is used to drain the ear
• Ring of rope or metal
• A washer or packing for sealing joints between sections of pipe
• Monty's opponent with large cast in great ring
• Madame going through rubbish finds ring
• Protective ring German field marshal left out in posh car
• Reinforcing eyelet in a hole
• Surgically implanted tube
• Ring shaped to line a small hole
• Metal ring for lining a small hole