Related Clues:

• Asmodeus, e.g.
• Couch potato's opposite
• Sinister spirit
• Mischievous imp
• Opposite of a layabout
• Take-charge sort
• Assertive type
• Hardly an idler
• Mover or shaker
• No bystander
• Idler's antithesis
• Industrious one
• One acting
• Active type
• "Buffy the Vampire Slayer" extra