It took me a while to get going in this one. I think HAMLET (25A: Source of the line "Madness in great ones should not unwatch'd go") was the first thing I put in, but it was a long while before I got much of anything off of that. Instead I ended up getting into the NE through the gimmies of 42A: Celerity (SPEED), and 33A: "Putting the phone down for a sec" in textspeak (BRB), which gave me CEELOGREEN, and so on. We're big fans of Julia Child, so CORDONBLEU was a welcome entry, as was YODA (10D: Someone who speaks like the quote in 25-Across). I usually find cross-referential clues off-putting, but when they make me laugh, they're all right. The other one today, 31A: Alert at 52-Down (ONAIR), actually ended up giving me WKRP (52D: 1970s-'80s sitcom locale). And now that I look at both of those, perhaps the "one way" reference is better than two clues that refer to each other. I'll have to see if that distinction holds up over time.
This just got better and better as it went along. ZEROWASTE (1A: Ultra-environmental policy) is a great start, and an even better goal. We haven't gotten there yet, but we put out less and less every week, it seems. We don't even fill one kitchen trash bag, and much of it is coffee pucks from the espressos. I know, those could go into the compost pile, but I think we might end up having a backyard that smelled like coffee after a while.... which, come to think of it, might not be all that bad...
But I digress. 60A: Criminal who welcomes a hanging? (ART FORGER) is a very, very nice clue. 26D: Dating standard (ANNODOMINI), too, was excellent. And it crosses UNIBROW (35A: Sign of lycanthropy, to some), HAMLET, RINGO, and the well-clued DESTINY (43A: It's often met "on the road taken to avoid it," per Jean de la Fontaine). I had "trouble" in there for a while. And I can't let the wonderful REGIFT (45D: Pass along, with dubious propriety) go without a mention.
I was not familiar with this definition of VIRTU (48D: Bent for collecting curios), and I didn't know 1D: Reimann ___ function (ZETA), nor had I heard the term TAXISQUAD (17A: Group of practice-only NFL players), so that T cross was an educated guess. That's the way it should be, though, on Saturdays. If I don't learn something from the end of The Turn, I feel a little cheated. No such disappointment this week!