It's deja vu all over again! ABS makes a return at 1A, NEINS at 47D, and another tic-tac-toe at 36D (OOX). We also saw LADD again, but referencing Cheryl rather than Alan.
I found this puzzle to have some very nice bits and some other areas I could have done entirely without. The theme is fine, as far as it goes. 56A is the revealer (ITSINTHEBAG), which lets us know that the first word from the other four theme answers are things you can have in a bag. ICEROADTRUCKERS is a nice 15-letter answer across the middle, while 45A: Structure built from the ground up? (SANDCASTLE) is an cute clue. I don't much care for TEAPARTIER, either the item in question or the term, which I think is likely better represented by "Tea Party member".
9D: Big egg producers (OSTRICHES) is excellent cluing. No question mark needed, but it's misdirecting nonetheless. 10D: TV/movie lead character whose middle name is Tiberius (JAMESKIRK) is kind of a gimme, but a nice answer anyway. Does it count as a kind of duplication that TIBER is in the grid also?
The companion pair of 9-letter down answers in the SW are not as strong, but still pretty good: DECOUPAGE and ACAIBERRY. I also enjoyed 20A: Rush experienced during a movie? (GEOFFREY), with its nice hidden capital. 14D: Swiss sub? (AMERICAN) is pretty good.
I like having BACH in the grid, especially when the clue references the non-existent P.D.Q. Erik SATIE gives an extra classical boost. AUDACITY is a good answer.
On the downside, SESS is always an ugly answer. I don't like when an abbreviation clue yields another abbreviation, like with RET. And ASSNS is also in there, along with NEA and NRC.
Is OOZY really a word?