Related Clues:

• Knocks lightly
• Base number
• Tune with only four distinct notes
• It's bugled on a base
• Eavesdroppers' equipment
• Army bugle call
• Bar fixtures
• Picks for a position
• Reveille counterpart
• "Lights out" bugle tune
• Last melody?
• Soldier's good night tune
• Draws upon
• Ceremonial bugle rendition
• Pub hardware