Related Clues:

• 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
• Watch sound
• Bell tower sound
• Bank feature
• Sound a Klaxon
• Common cell phone feature
• Loud get-up?
• Opine, with "in"