Related Clues:

• Harness racer's gait
• Speed
• Move it
• It starts and ends with a line
• The Hambletonian, e.g.
• Track pace
• Derby, for one
• Derby, e.g.
• Mudder's day event
• Hustle
• Census datum
• 440 or 10K
• 100-meter, e.g.
• Example of 15-Across
• Hurtle