Possible Clues:

• Opponent or enemy
• The Reverend Father is the first to come back with his foe
• One's not 4U
• Moriarty, to Holmes
• Opponent, antagonist
• I’ll oppose memorable date, making second to fourth day
• Enemy
• Davy rears fiendish contestant
• A singular clergyman turned into a dull opponent
• There's a dry saver that's not on your side