Possible Clues:

• Are fighters exhausted in this?
• Sport in which participants struggle, grappling with tiredness?
• Knackered wife to relax with swimmer's sport
• We'll instal ring specially arranged for this sport
• Are its combatants exhausted?
• Spent pounds securing prize in grand sport
• Fighting sport
• Tired with combat, sport?
• Revolutionary still learning about western fighting
• Exhausted? With a breather, fish will provide unlimited sport