I like to think of this puzzle as a sendoff to a certain individual. YOUREFIRED being applied to him with a modicum of dramatic irony.
The theme is a set of synonyms for letting an employee go, all hidden at the end of more standard phrases. Thus, GARBAGECAN and BATTLEAXE. These are nicely hidden, in my opinion, although the marquee phrase QUARTERBACKSACK may get its word from a similar etymology. Okay, so maybe not! Instead it seems to come from the sense of sacking a city. Nice!
I'm going to apologize for the brevity of this review. It's been a crazy day and night for various reasons. Suffice it to say that I liked much about this puzzle. Very smooth and straightforward, with a couple of fun clues like 69A: Dealer in futures? (SEER) and 70A: It's a plot! (ACRE).
Also, 4D acts as an antidote to this company that's laying off people left and right. NOCUTS!