A nice tribute to the recently deceased hero of screen, song, and politics. Lots of theme material, mostly symmetrical (not TATA or ATTENDEE), and without too much suffering in the fill. With the possible (probable) exception of ILOILO (16A: Phillippine seaport with a reduplicative name) and STARER (65A: Rubbernecker), but hey, they're symmetrical, too, so that's cool.
I knew he was imprisoned for a long time, but ROBBEN ISLAND (8A: With 68-Across, prison where 36-Across (NELSONMANDELA) spent 18 years) was not something I knew. Also learned the term PONYCAR (24A: Class of automobile inspired by the Ford Mustang) today.
I'm not sure why a VAT should be an "63A: Acid holder" rather than a holder of just about anything, but, well, it's a Mandela tribute puzzle, how critical am I going to be?
In non-theme fill, we enjoyed WALLOWIN (2D: Be immersed by), FREEREIN (6D: Unlimited latitude), and TRIAGE (49D: Battlefield procedure).
Merry Christmas, if you're celebrating, and if not, and you're in the northern hemisphere, happy winter!