Related Clues:

• See 29-Across
• Romulus, to Remus
• Lather
• One of two of a kind
• Sealy choice
• Beer topper
• "... oceans, white with ---"
• Type of rubber
• Castor or Pollux
• Sea froth
• Champagne overflow
• Pillow filling, sometimes
• Apollo, to Artemis
• Look-alike
• Mirror image