The venerable Henry Hook is back with the Thursday January 3 puzzle and it's predictably delightful. What do an ad icon since 1914, Oswald Cobblepot's nom de crime, the caretaker for the Banks household, and Churchill's predecessor have in common? They were all known to 56 Across but the answer is too much fun to just tell you so only click the clues above if you're really stuck.
Oh, and this clue deserves special mention: "Roast setting" is DAIS. Did Mr. Hook or Mr. Shortz come up with that one, I wonder.
Matt Gaffney's book Gridlock has an interesting chapter on Henry Hook.