Related Clues:

• Freeze front
• Matter or body start
• Start to freeze
• ___-inflammatory
• Dissenting one
• Dead set against
• Opposition member
• Climactic beginning?
• Like some debaters
• Part of a definition, maybe: Abbr.
• Not a pro
• Picketer, perhaps
• Prefix with proton or ballistic
• Prefix with hero or matter
• Negative prefix