Possible Clues:

• "And that's that!"
• "That's all she wrote"
• "And that's that"
• ''And that's that!''
• Review so often dry? No further discussion needed
• No more discussion when it's time to close the book
• Various trendy foods daughter cut out, and that's that
• That's that setter's way of cluing Y, perhaps
• "That's all she wrote," and literally, what the last word of each starred answer can be
• 'Nothing more to say'