The Southern drawl, droopy eyes, stringy hair and face cracked by the elements lend themselves to playing hicks and 'white trash' roles, and William Sanderson has played them for over twenty years. He is perhaps best recalled as Larry, the speaking member of a trio of brothers on the long-running CBS series "Newhart".Sanderson is anything but a hick, however. After a rebellious youth and a stretch in the army, he graduated from Memphis State University and then went on to its law school. Sanderson opted to move to NYC to pursue an acting career rather than practice law. He found work