Related Clues:

• Post-toast sound
• Hoosegow
• Notorious London prison
• Can
• Sound from a toaster?
• Sound of touching glasses and this puzzle's theme
• Jail, slangily
• Prison
• What many champagne glasses do
• Dickensian prison
• Jailhouse
• Toast sound
• Ice-in-glass sound
• ... champagne glasses
• Toast indicator