Related Clues:

• Prefix with concert
• Negative in Normandy
• Dissenting one
• Dead set against
• Opposition member
• Start for profit
• Climactic beginning?
• Like some debaters
• Insult, in the hood
• Not a pro
• Picketer, perhaps
• "Bad" combining form
• Prefix with proton or ballistic
• Prefix with hero or matter
• Opposing side