Related Clues:

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