Related Clues:

• One on the other side
• David, to Goliath
• Business competitor
• ABC, to 14-Down
• Bizarro, to Superman
• A McCoy, to a Hatfield
• One to go up against
• Close competitor
• One against another
• Nearby school, maybe
• Axis, once
• The other army
• No proponent
• Scarecrow, to Batman
• One to counter