Related Clues:

• 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.
• Car buyer's option
• Bedside noise
• Bank feature
• Sound a Klaxon
• Gauge of heat or light, e.g.