Related Clues:

• Track competitor
• Horse's burden
• Indy 500 entrant
• Slot car, e.g.
• Amendment
• Dragster
• Greyhound, for one
• Subway patron
• Bill add-on
• He sits in a lot of laps
• One on the fast track?
• One dragging, maybe
• ''Speed ___'' (early anime hero)
• One of 13-Down
• Track figure