Related Clues:

• Storm warning
• Morning warning
• Clock feature
• Emulate Paul Revere
• Cell phone feature
• Eye-opener of a kind
• "Fore!" for one
• Clock/radio feature
• Give a heads-up to
• Readiness condition
• Yellow flag
• More than dismay
• Foghorn, e.g.
• Car buyer's option
• Bedside noise