Possible Clues:

• Dissonance
• Bump in the night
• Racket, to a landlord
• City ordinance subject
• 'Get one in the snout, by the sound of it (5)'
• Urban pollutant
• One is sound in the snout
• Gets blown about one, by the sound of it
• Bump in the night, say
• Napper's nuisance