Related Clues:

• Doing the job
• Riveted
• Fascinated
• More than attentive
• Thoroughly involved
• "He's ___ again!"
• Deeply focused
• Kind of attention
• Going __: squabbling
• Exchanging words
• Keep __ (persevere)
• Really paying attention
• Words after hard or keep
• Extremely attentive
• Steadily working