clearance sale; inventory liquidation sale
A sale event where a store sells off excess or discontinued stock at reduced prices.
That store is having a clearance sale now.
I was able to buy it cheaply at the clearance sale.
A general sale event; 在庫処分セール specifically means a clearance sale to reduce inventory.
A bargain sale, often with a festive atmosphere; 在庫処分セール focuses on liquidating stock.
Compound of 在庫 (inventory), 処分 (disposal), and セール (sale).