The Clue Seller's disclaimer "On ___ basis"
The Answer ASIS
The phrase "On AS IS basis" is often used in sales to indicate that the seller is not making any guarantees about the condition of the item. This means the buyer accepts the item in its current state, without any promises for repairs or refunds. It's a common disclaimer in real estate and used for second-hand goods. Therefore, "AS IS" perfectly fits the crossword clue about a seller's disclaimer.