Possible Clues:

• Bell hit with a mechanical hammer
• Disklike percussion instrument
• Talent-show signal
• Percussion instrument with a 'wind' variety
• Source of summons making us cross, possibly
• Beat it and it goes off, by the sound of it
• Dinner call - medal
• Medal pinned by king on general
• 1970s TV's 'The ___ Show'
• Instrument shaped like a disk