Related Clues:

• Hostile one
• Contrarian, e.g.
• Foe's position
• Coke, vis-a-vis Pepsi
• Romantic competitor
• Dote preceder
• Pro's foe
• Not supporting
• Not for
• Less-than-climactic start?
• ABC, to CBS
• Yankees, to the Red Sox
• The "A" of ABM
• Coke, to Pepsi
• Knock or social preceder