Related Clues:

• Apply one's John Hancock
• Place your name on
• It might be high
• Use Ameslan
• Catcher's putdown?
• Convey via Ameslan
• Hint of the future
• Make legally effective
• Endorse a check
• Leo or Libra
• Billboard
• Highway sight
• Communicate by hand
• Unharmonious
• Affix an X, maybe