Related Clues:

• Aid for a straight line
• Monarch - drafting tool
• Strip used in drawing straight lines
• It helps to draw straight lines
• Shah, e.g
• It could be used to strike a sovereign
• Headpiece in school bag
• Back-to-school shopping purchase
• Something marked off in school
• Sovereign one
• Queen, e.g
• Shotgun caliber
• Desk-drawer item
• Judge
• Can have the measure of most things in the castle