Wow, what a great finish to the week! It was a good old-fashioned stumper that we passed back and forth while sitting on the couch drinking espresso, then, an hour or more later, tea. It wasn't until well past the hour mark, when we had all of the trick questions, that we finally hit upon the solution to the clues. BATTLEFIELD (19A: 81 ÷ 27), for example, requires you to look at clues 81 and 27, which are PLACE (81A: Cul-de-sac, in some addresses) and WAR (27A: It's conducted in a theater), resulting in "war place" or, BATTLEFIELD. Why division in this case? I don't know. In another case, it's more clear - GROSSPROFIT (33 - 21) is NETSALES - COSTS, and REPEATEDLY (63A: 56 x 42) can be seen as multiplying MANY (many, many) and OVER (over and over). Maybe BATTLEFIELD is a place divided by war. OK, that works for me, and makes this already good puzzle even stronger.
There were "many, many" entertaining clues today, like 88A: Wind stopper (BEANO), 91A: Lay low? (INTER), 22A: Bee relative (OPIE) - tricky!, 9D: Turn down a raise? (FOLD), 20D: Cut from a log, maybe (ERASE), 45D: Change the plot of (REMAP), 68D: Like boxers (CANINE), 31D: #1 fans (EGOTISTS) … so many good ones!
We didn't know CAIMAN (7D: South American reptile), or NELLE (37D: ____ Porter, "Ally McBeal" role) (Really? Ally McBeal?), and it took us forever to remember MEATBALLS (29D: 1979 comedy set at Camp North Star), but I'm actually pretty proud of us for forgetting it so thoroughly.
Overall, a very satisfying Saturday.