Related Clues:

• Subway feature
• No soothing sound
• Use a trumpet
• Babel
• Flamboyance
• Roar
• Loudspeaker sound (and a letter bank for 60-Across)
• Disturber of the peace
• Cause for earplugs
• Background noise
• Airport nuisance
• Crowd noise
• Disturbance
• Traffic jam noise
• Headache intensifier