Related Clues:

• 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
• Common cell phone feature
• Sign of warning
• Loud get-up?
• Reason to get up in the morning?
• Break-in indicator
• Surprise big-time