In my neighborhood, that restriction is reserved for the arteries within a half mile of Wrigley Field around game time. Like 58A, this sounds like it's about appliance repair, but it's not: ORS, or operating rooms, are. Never heard of, but LIAM is a guessable Irish name (and the lovely name of my cousin's baby boy). Ornithology! The is a CREST atop its head. has an even cooler first name than Grandpa Walton: ERSKINE. ZEB! I never knew Grandpa Walton had a name. EAT ONE'S HAT is a great phrase, balancing out ONE OVER PAR in the grid. It would be lovely if the RESERVISTS had no war to attend. As with the GNU clue, I like the new twist on an old 3-letter answer. Were you thinking of baseball? Bzzz! Gotta love having three consecutive clues that aren't about sports but might fool sports nuts.
Nice to see a fresh (if gruesome) GNU clue. But out on the savanna, a lion might bring down a GNU. are you thinking of sports, the Detroit Lions? Bzzz! The Lions are terrible at scoring. Speaking of potty words, PEE is clued as 44D: because P is the last letter of "top." Heh. Speaking of Scrabble, in a Lexulous game (that's the loose facsimile of Scrabble on Facebook) tonight, I bingoed by playing DOODIES, and twigged the S off CRAP so that CRAPS and DOODIES cross. Three Zs, three Qs, a pair of Ks, and an X? Me like.
If so, Peter Gordon's Fireball Crosswordswill be right up your alley. You're probably here because you like the harder crosswords that are published later in the week.