Author: John Farmer
Theme: Actors nominated twice for Academy Awards for the same role.
If I'd racked my brain I probably could have got 47A: 1972 and 1974 Oscar-nominated role for Al Pacino (MICHAEL CORLEONE) even though I haven't seen any of the Godfather movies -- or the Sopranos or any other gangster-related shows. Just have zero interest in gangsters, I guess. (Pacino didn't win an Oscar until "Scent of a Woman" which was not one of his best roles either, if you ask me. )
And maybe if you had a gun to my head I could have come up with 26A: 1944 and 1945 Oscar-nominated role for Bing Crosby (FATHER O'MALLEY) only because it seems Bing was always playing either a priest or a guy on the run with Bob Hope, crooning to Dorothy Lamour.
But I did not know 33A: 1964 and 1968 Oscar-nominated role for Peter O'Toole (KING HENRY II) or 56A: 1998 and 2007 Oscar-nominated role for Cate Blanchett (QUEEN ELIZABETH I). I don't know, maybe movies about ROYALTY (16A: Payment to an author, perhaps) appeal to me as movies about gangsters. O'Toole by the way played King Henry in Becket and The Lion in Winter. Blanchett played Queen Elizabeth in Elizabeth and Elizabeth: the Golden Age. The same year she was nominated for that latter Liz, she was also nominated for playing the role of Bob Dylan in I'm Not There.
Only other Oscar winner I see in this puzzle is at 29D: Charles portayer (LOY) . That's Myrna Loy, who did not win an Oscar for her role as Nora Charles in the Thin Man movie series or any specific role. Instead she won a lifetime achievement award shortly before she died in 1993.A couple of other entries that caught my eye: