Possible Clues:

• One may go off with it
• Knock [don't allow to have a key]
• Shooting sound
• ... taking case that contains new boom
• __ for the buck
• Report of narcotic
• Report suggesting 'allow notes A-F'?
• Big noise
• “Hary mugwort […] had been put into deten by sigismund the mad maths master for saing ____ whenever a perpendicular was droped” (Nigel Molesworth)
• Colt's noise