Related Clues:

• Foghorn, e.g.
• Car buyer's option
• Bedside noise
• Bank feature
• Many a door feature
• Auto shaft attachment
• Sound a Klaxon
• Gauge of heat or light, e.g.
• Common cell phone feature
• Canal gate
• Loud get-up?
• Hard-to-break hold
• Reason to get up in the morning?
• Motor part
• Electric eye, for one