Related Clues:

• Via or mono follower
• Ornamental pond fish
• Murmur of discontent
• Train-track part
• Grievous sound
• Complain, so to speak
• Sound of suffering
• Sound of pleasure, perhaps
• Pool table boundary
• Track border
• Koi, for one
• Train support
• Bannister or barre
• Subway power source
• Climactic sound?