Related Clues:

• In the act
• Working busily
• Busting one's hump
• Engaged in a 38-Down
• Attacking the job
• Have ___
• Going full tilt
• Unable to agree
• 'While you're ___ ...'
• Trying hard
• Doing something
• Toiling hard
• "Look ___ this way ..."
• Toiling or bickering
• Like bitter rivals