Related Clues:

• See 20-Across
• Signal for an act to end
• Dinger
• 'Saved by the ___!'
• ___ pepper
• Collar attachment
• See 17-Down
• Signal to leave
• It may be hit with a hammer
• End-of-class signal
• Unit of nautical time
• Percussion instrument
• Time unit at sea
• Ring source
• Class ender