Possible Clues:

• Racket sport's first runner
• Fraud created by head of school with academic stream
• Swindle or confidence trick (slang)
• Returned coats in swindle
• Too-good-to-be-true offer, often
• Offer that's too good to be true, often
• Do a Bernie Madoff job on
• Something shady
• Swindle in tennis camp
• Shady business