Today's puzzle is dedicated to one ROBERT DENIRO, who turns 75 tomorrow. I quickly realized that many answers were movies, and I also realized that they were DENIRO movies, but the first thing I tried to put in at the bottom was "Martin Scorsese." Idiot. "Martin" fit, and I actually left that in for a hot minute thinking that maybe they'd somehow squeeze his last name into the other space...
Anywho... it wasn't Scorsese.
I've grown up with DENIRO movies, and I am one of the many of my generation who think of him as one of the greats. So am I going to raise a fuss about a few things that CLOG the grid? Like ABIE (48A: Title lover in a 1922 Broadway hit) (from that classic "Abie's Irish Rose"), SADR (51D: Baghdad's ____ City), ARNE (35D: Obama education secretary Duncan), BIER, ISIN, ATIT, OISE, PROSY, ENTR, APER, BRRR, EDD, ALMAY, and AMMETER (37A: Current measurer)? (YOW!) No! I'm going to be happy for the good trivia in the clues for OBERLIN (17A: First coeducational college in the U.S.) (since 1837), and DOUGLAS (62A: Justice with the longest Supreme Court tenure) (36 years!), and about having dropped in ORLANDO (16A: "As You Like It" hero) as my first answer thanks to having seen my brother play the part in a college production many years ago. Ahh... memories.
It's a tribute puzzle, and sometimes one just has to sit back and enjoy the theme density that comes with STARDOM.