The term 'One on the Fast Track' can be described by three different crossword solutions: RACER (5 letters), SPRINTER (8 letters), and Racecar (7 letters). A RACER is a person who competes in a race, usually involving cars, motorcycles, or horses. A SPRINTER is an athlete who specializes in running short distances at high speeds. A racecar is a vehicle specifically designed for racing. All three of these terms refer to someone who is on the fast track, either literally or figuratively.