Related Clues:

• Scrap for a boxer?
• A clash between boxers, a scrap that's up in the air?
• It's cause a bone of contention?
• Rough-and-tumble
• Clash between boxers? Scrap that's up in the air
• In which boxers do combat?
• Pilots' combat
• Close aerial combat
• Ferocious struggle
• Conflict between setters, say -- in which one may be shot down
• Contest between boxers say that’s up in the air?
• Aircraft battle
• Highly aggressive tussle with boxers?
• Heightened clash of brawling boxers, say
• It's a ferocious struggle getting boxer to box