Possible Clues:

• Make a sign with your fist
• Famous person's signature
• One's handle in one's hand
• A tough par to play, then sign
• Gap author possibly found in signed copy
• Car dealer's chart?
• Signer will give this pat, a rough translation
• One's signed a chart showing car's performance?
• (Celebrity's) signature
• Diagram of car, a collector's item perhaps