Jack Clayton, 73, a movie director who began an era of social realism in British film with "Room at the Top" in 1958 and directed Robert Redford in "The Great Gatsby," died Saturday at a hospital in Slough, England, 15 miles west of London. His small but admired body of work included "The Innocents" (1961), a surreal retelling of Henry James's ghost story "The Turn of the Screw," starring Deborah Kerr; and "The Pumpkin Eater" (1964), about marriage, divorce and adultery, starring Anne Bancroft, Peter Finch and James Mason. "Room at the Top," starring Laurence Harvey and Simone Signoret, was an indictment of the British class system. Its sexual frankness and its images of provincial poverty charted new territory in British realism. It was nominated for an Academy Award for best picture, and won Oscars for Ms. Signoret and screenwriter Neil Paterson.