Related Clues:

• NASCAR event
• It may have four legs
• Sort of lens
• Tortoise-hare affair
• It's sometimes a drag
• Tour de France, for one
• Olympics event
• Marathon, e.g.
• Camera accessory
• Word with course or horse
• Scurry
• 10K, for one
• Type of horse
• One may be on its last leg
• Marathon