Possible Clues:

• Bone from old South American people showing one mutation
• One body of students holds copyright for part of sound system
• ... shortly to become liable for second anvil
• Trendy son carries copper anvil
• The central of the three small bones in the middle ear of mammals
• Anvil's casing of iron -- copper's added
• Used to hear a little anvil in copper and sulphur
• At home, coppers with bone of listening equipment
• Latin for “anvil”; one of the three ossicles in the ear
• Hard part of the Listener suffers, losing solver finally