Related Clues:

• In a negative camp
• Member of the opposition
• Aircraft beginning
• One set against
• Inflammatory prefix
• Hostile one
• Contrarian, e.g.
• Foe's position
• Dote preceder
• Pro's foe
• Not supporting
• Not for
• Less-than-climactic start?
• Pessimist
• The "A" of ABM