Possible Clues:

• Drain ear after first of piercings
• Opening in a sink
• Advertise target when putting in plumbing feature
• Down which things run away or get lost?
• Ring found in sink quietly put on ear
• One of those of in Bath and Cork synonymous with golf course
• Bath drain
• Soft, shell-like thing water runs down
• Entry of pipe organ underpinning piano
• Last bit of soap on ear — something you may see in bath