Possible Clues:

• Volume improver
• Head Mechanic?
• Has meekly compromised over current British businessman
• Karaoke prop that often ends in "c" nowadays
• Karaoke prop that often ends in 'c' nowadays
• This makes MP a deputy leader
• Talk show guest's device
• Source of feedback, informally?
• Amplifier on a lapel, for short
• What a singer may dramatically drop, informally