Related Clues:

• Fiercely committed to a cause
• Bumping heads
• A bird mating?
• "Have ___!" ("Go right ahead!")
• In a scuffle
• Going hard
• Aggressive note easily seen by worker
• In a quarrel
• A bird busy as a bee?
• Grinding along
• "While you're ___ ..."
• "Look __ this way ... "