Related Clues:

• 14 Down patron
• Jockey, essentially
• Subway passenger
• Passenger, Irish from the South, turned crimson
• Bus fare payer
• Possible equestrian’s addition to contract
• One in the saddle
• Horseman's answer ignored by attacker
• "If 6 Was 9" off Easy ___ soundtrack
• 13's condition?
• Any commuter on a bus
• One taking the bus
• Attacker expressing a further requirement
• In geometry, a problem based on a theorem
• Cycling competitor's additional clause?