Related Clues:

• Piano practice
• Proportion
• Justice prop
• Butcher's device
• 100 to 1, e.g.
• Map key
• Bathroom floor item
• Atlas picture
• Vitally important
• Put a scratch in, as a car's paint job
• Boxed-off map section
• Post office need
• Section for Hawaii or Alaska, maybe
• Loch Ness monster, e.g.
• Organ piece