PMC administratorThe sprawling, stone-clad Chesapeake Bay estate of Tom Clancy, the late, best-selling author of spy-thrillers like “Patriot Games,” “The Hunt For Red October” and “Clear And Present Danger,” recently sold for $4.9 million, much below its $6.2 million asking price.The pastoral property was where Clancy dreamt up many of his most famous and enduring characters.