Related Clues:

• Champagne adjective
• Urban pollution
• Headache augmenter
• Discordance
• Twinkling of an eye, say
• Min. part
• Harsh sound
• Org. that protects investors
• Heartbeat, so to speak
• Wine description
• White thing that may be heard?
• Clue for a car mechanic
• It's not in the library often
• Blanchett of 'The Aviator'
• Annoying sound