Related Clues:

• Enter the marathon
• 'If a ___ is happy, it cannot fit too close': O. Henry
• Certain Internet page
• Look for a seat
• Terse directive to a chauffeur
• Runner's goal
• Exercise area for boxers
• Common Web site link
• Do a 5K, say
• Try for office
• Take flight
• Throw your hat into the ring
• Tune from ''The Wiz''
• Join the race
• Visitor's opponent