Related Clues:

• One of 13-Down
• One on horseback
• Cyclist or equestrian
• Fare payer
• Band's demand list
• Agreement addendum
• Paul Revere, for example
• Rodeo contestant
• 25 Down passenger
• War classic "Low ___"
• Policy postscript
• Headless Horseman, e.g.
• Mass-transit customer
• It may be added to a contract
• What a racehorse needs