Related Clues:

• Anti-theft device
• Eye-opener?
• Fill with fear
• It's a real eye-opener
• Antitheft device
• Wake-up call
• Clock-radio feature
• Morning surprise, often
• Morning warning
• Clock feature
• Cell phone feature
• Eye-opener of a kind
• Clock/radio feature
• More than dismay
• Foghorn, e.g.