Possible Clues:

• Long-distance foot race
• You can run it
• Greatest challenge in running old bar
• Staff restricts regiment, even if in battle
• Mum raced round front of the house - no easy task
• Footrace of approx 26 miles
• The race of the mother rodent gets to be an honorable one
• The longest foot race.
• Unusually long
• Lasting event?