Related Clues:

• That will keep His Majesty on the straight and narrow
• That's where the one at the top can draw the line
• Where one might draw the line - being on the throne
• The sort of king that is made to keep one straight
• Can one measure a U in EGG?
• This will help one to draw the line at being president
• Must not be a crooked king
• His Majesty will keep one on the straight and narrow
• A you in the egg up there between the rails
• A straight monarch
• Means of measuring a sovereign
• Authority for government measures
• Governor left with the Queen after the game
• Straight strip, guv?
• The measure of authority?