Possible Clues:

• Supernaturally evil
• A saint out and about like their adversary?
• Wicked to the max
• Leaderless fanatics can be devilish
• Relating to the Devil
• Like a devil or a saint gone astray, getting caught
• Supremely evil
• Like controversial verses as written about a function
• Fiendish setters always take assumed names in crosswords, initially
• A saint out and about, like his adversary?