Related Clues:

• Clash between boxers perhaps that Sky would stage?
• Follow key number, heading off for battle
• A match for boxers coming to blows - a contest that's up there with the best of them?
• High-level engagement, a contest for setters?
• Canine battle (in the air?)
• Close combat between military planes
• Scrap extremely garish suit jackets after trouble
• Ace-versus-ace sky battle