Just Google "[name of beer] clone" or "[name of beer] recipe." If someone has come up with a clone, you should be able to find it. If you're looking for Pilsner Urquell, you'll be in luck - there's even a specific Pilsner Urquell yeast.
Word of warning: Some clone recipes are way off or are nothing more than untried guesses. For some other beers, nobody has come up with a clone recipe. But, esp on this site, there are good, tried and true clone recipes for lots of good beers. GOod luck!