Related Clues:

• Curve, as the back
• Shoe support
• It may fall on a foot
• Rascally
• Prone to pranks
• Half a McDonald's logo
• Dramatic entryway
• Instep, e.g.
• Supporting structure
• Span
• Foot shape
• St. Louis' Gateway, e.g.
• Lead-in for enemy
• Classy entrance
• Nemesis or conservative preceder