Possible Clues:

• Show contempt for first of MPs to become suddenly prosperous
• Resonant sound, like artillery
• Crane component
• When business is great, opposite to bust
• Ka-blam!
• Sound prosperity
• Resonant sound of TV equipment — it sometimes accompanies 19
• The noise of increased business activity?
• Prosperity - hollow roaring noise
• Hollow sound? It's said to surprise many