Possible Clues:

• Way to unload hot merchandise?
• Purge with deep discounts
• Post-arson markdown?
• Starts 15 across with initial stiff drink - it suggests closing time might be an option
• Where prices of goods go down after they've gone up?
• "Everything must go" event
• Ploy to avert bankruptcy
• Everything must go in it
• Event with steeply discounted prices
• Fast disposal