Related Clues:

• Leadership position
• Viaduct feature
• ''Duke'' starter
• Impressive entrance
• Cruise director?
• Tongue-in-cheek
• Design feature of many a viaduct
• Bend over backward
• Driver's seat
• ___ of Constantine (landmark in 45-Across)
• It's big in St. Louis
• Leader's position
• Rock formation
• St. Louis symbol
• Ship tiller