Related Clues:

• Contrary to
• 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
• Start of a Tennessee Williams title
• With the enemy, perhaps
• ''Social'' leader