Related Clues:

• Immersed
• Getting the job done
• Anything but bored
• Totally attentive
• In the act
• Not merely paying attention
• Working busily
• Engaged, in a way
• Busting one's hump
• Absorbed in
• Not at all bored
• Engaged in a 38-Down
• Attacking the job
• Have ___
• Going full tilt