Donald Moffat, the character actor who nailed Falstaff’s paradoxes at the New York Shakespeare Festival, a grizzled Larry Slade in Eugene O’Neill’s “The Iceman Cometh” on Broadway and a sinister president in the film “Clear and Present Danger,” died on Thursday in Sleepy Hollow, N.Y. He was 87. *** Moving to America as a 26-year-old actor was the realization of a dream for Mr. Moffat, his daughter Lynn recalled in a telephone interview. “One reason he was anxious to leave England was the class system,” she said. “He hated it. And he loved Americans.