A classic Friday. I got off to a fast start in the NW with the excellent LAWYERUP (1A: Prepare for a court battle), the old-school ONEONONE (15A: Common court battle), and the modern GOPUBLIC (17A: Tell the world). It's just too bad that ESTREET (19A: Locale of the American Red Cross headquarters in Washington) wasn't clued with a Bruce Springsteen clue, but I suppose that would have been more of a Monday/Tuesday kind of thing.
It got harder for me after that. STEPPED (11D: Like ziggurats and some mesas) went right in, but MASSEXODUS (12D: Lots of outgoing people) (nicely clued), took quite a bit longer.
I liked the pair of "imposed" clues, preferring FOISTED over SADDLED, but both are good words. The SE is totally solid today. Love WAITWHAT (56A: "Hold on ... did I hear that correctly?"), and ENDNOTES and FIRECODE are also good, and it took me a long time to figure out that both 47A: Single or double (GETAHIT) were being used as verbs. The SW is less good, with AGORAE and ISAO, and I don't particularly love EARLYSTAGE (25D: Embryonic), but FREAKOUTON (26D: Subject to a hissy fit) (another sneaky verb) was amusing. And speaking of the SW, I had "STUDIoS" in for 45A: Writing rooms (STUDIES), and didn't know NED (43A: Leo's advisee on "The West Wing"), so I just could not come up with JETER (43D: Captain Clutch of baseball). Honestly, I was all set to take a DNF, but Frannie took a look at it and finished it up in about two minutes. I also had trouble with GINA (47D: Actress Carano of "Fast & Furious 6," 2013), VERDI (44D: One who made many Shakespeare characters sing?) (I kept wanting a Muse!), and the aforementioned GETAHIT, but Frannie fixed all that up, too.
Anyway, overall I enjoyed the challenge, and I decree this to be a good Friday!