Related Clues:

• Tombstone, e.g.
• Bread portion
• Wedge of pizza
• Pie serving
• Foundation piece
• Concrete block
• Pizzeria purchase
• A flat, thick piece
• Pizza piece
• Pizza parlor purchase
• Get ready to become a 21-Across
• Remove, as paint
• Piece of cloth
• Big piece of cake
• Cement piece