Related Clues:

• Exorcist's enemy
• She's busy
• Incubus
• Hardly a slacker
• Enthusiast, plus
• Possessor?
• One with many accomplishments
• Slacker's opposite
• Couch potato's antithesis
• Exorcist's adversary
• Screwtape, for one
• One who takes action
• Manitoba's Premier Gary
• Devilish sort
• Lazybones' opposite