Took a lot of trial and error, but I managed to complete it. Looked up certain clues and used the "Check Puzzle" button a few times.
spoiler: answers discussion
Got SHORTENING, but took a while to get the rest of the themes clues. Felt like a genius when I figured it out.
Lower left corner was a slog. The clues I had to look up: 26D "First woman in the National Baseball Hall of Fame" and 59A "Part of the Hollywood monogram J.E.J.". Thought it was some kind of trio. 49D "Grub, e.g." was a confusing one as well.