Related Clues:

• Social opening?
• Voting second in a voice vote
• Prefix with body
• Con's stance
• Prefix with lock
• Debate position and half of this puzzle's theme
• Argument side
• A demonstrated position?
• Body opening?
• Flimflammer
• Put something over on
• Opposer
• Not even a semipro?
• In opposition to
• 'Nay!' sayer