Possible Clues:

• Art that requires a folder
• Ring French friend about fake Japanese art
• Paper-folding skill
• Folding dole cheque up with a note
• Japanese paper-folding
• Japanese art equipment held by old French pal
• Going up — a regular payment to support setter's work in paper
• Circle in Latvia takes cars, on paper, made in Japan
• Work from a folder
• Work for a folder