Related Clues:

• No proponent
• Scarecrow, to Batman
• One to counter
• Ill-wisher
• Source of conflict
• Hatfield, to a McCoy
• Sentry's classification
• "Who goes there, friend or ___?"
• Cassius, to Caesar
• Grant, to Lee
• Them, often
• Am archaic enemy
• Archaic male enemy
• It's mean of him not to be on your side
• Could be the name of the one turned against you