Related Clues:

• Bugle ''lights out'' tune
• Two hours before midnight
• Pats lightly
• Commonly used base
• Bugs; valves
• 'X' amount
• Diamond, to Mohs
• Dudley Moore/Bo Derek film
• Face value, in blackjack
• One meaning of X
• The U.S. Treasury is on its back
• Music on base
• Lights-out song
• Call in the evening
• Roman numeral X