Possible Clues:

• This would be the devil of a short street at any rate
• "Buffy the Vampire Slayer" extra
• Troublemaker gets number to back protest
• Fellow holds me up showing bad spirit
• Bad spirit revealed by protest note
• What the devil is the professor doing around me back there?
• Succubus, e.g.
• Mischievous imp
• The very devil of a way it all goes to show it strates, perhaps
• Familiar, perhaps