Manhattan's Riverside Park cops put the squeeze on a kid selling lemonade with a $50 fine for doing business without a permit yesterday. "It was such a hot day I figured people would want a cold drink," said Clementine Lee, 10, dreaming of liquidity. Thick-skinned police made Clementine and her irritated pop close up shop. But the parks commissioner has decided to ditch the ticket. "We're making lemonade out of lemons," Adrian Benepe told the New York Post.