Related Clues:

• Words after hard or keep
• On the clock
• Steadily working
• Getting the job done
• In the act
• Working busily
• Busting one's hump
• Engaged in a 38-Down
• Attacking the job
• Have ___
• Going full tilt
• 'While you're ___ ...'
• Trying hard
• Doing something
• Toiling hard