Related Clues:

• Pledge a tenth
• Sale add-on, perhaps
• Price add-on
• Tam sporter
• Glaswegian, e.g.
• Mary Stuart, e.g.
• Mathematician Napier, for one
• Caledonian
• Part of the tab, often
• Give 10 percent
• With 8-Down, museum material
• Pass judgment on
• Keep 90 percent
• All right
• Word with luxury or sales