Related Clues:

• Climactic beginning?
• Like some debaters
• Words on a jacket
• Not a pro
• Picketer, perhaps
• Brief advertisement
• Prefix with proton or ballistic
• Prefix with hero or matter
• Negative prefix
• Opposing side
• One of the opposition
• Apt to say nay
• Opposed one
• Prefix with thesis
• Dissenter's position