Very nice! Fresh long entries. Also liked the clues; 20A, 13D, and 28A were clever, 36D was funny, but 56D was hilarious. Certainly some glue (34A) but very gettable. A few opinions:
I liked 37A but felt the clue was a little bit askew; maybe “4x4 ride during a safari, colloquially”
I see 6D as more Australian slang than British, so I might have chosen “Bruce”.
Thanks for the thoughtful comments! The clue for 51A comes from the idea that a criminal defendant should be guilty "beyond the shadow of a doubt". I agree, though, that the clue is clunky.
First Chinese dynasty, as traditionally spelled (it's an anagram of one of the main branches of Islam)
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Across
1A
First Chinese dynasty, as traditionally spelled (it's an anagram of one of the main branches of Islam)
5A
"Jumpin' Jack Flash, it's ___ ...." (Rolling Stones)
9A
Equivalent of "make good decisions"
15A
Outburst on a brigantine
16A
Bite
17A
"___ de mitad" (midterm)
18A
Word after "Pussy" or "Quiet" in a band name
19A
"Meh"
20A
Class that might be integral to getting college credits, briefly
21A
Enough coffee to keep me awake through a trip to the fabric store
22A
Beginning of a question that's usually rhetorical and annoying
24A
Sir Paul, alternatively
26A
Food scraps, in crosswords and maybe in 19th century England. (It's also an anagram of what happens to food if you leave it out too long)
27A
Aleve, e.g.
28A
American company founded by a Turkish Kurd to make Greek yogurt
30A
Letters on an ambulance
32A
Apt.:residence::___:office
33A
"___ cat" (one who might be too cool for school)
34A
___ rug (Scandinavian floor covering)
35A
"___ not the favor of the multitudes; it is seldom got by honest and lawful means" (Immanuel Kant)
37A
4x4 safari, colloquially
42A
Verbal tap on the shoulder
43A
Gov't agency since 1970
44A
Blissed out
45A
Understanding sounds
48A
Poet Laureate ___ Limón
49A
"Take Five" composer and Brubeck bandmate
51A
It casts a metaphorically (or at least legally) small shadow
53A
Fool
55A
"Don't wanna die in a Super 8 ___" (Jason Isbell, "Super 8," a great song from his brilliant album, "Southeastern")
57A
Oft-requested information, I'm assuming
60A
"___ Little Teapot"
61A
Possible benefit
62A
"Well, Did You ___!" (Cole Porter tune sung by Sinatra/Crosby and Deborah Harry/Iggy Pop, among others)
63A
Arrived home, perhaps, for a bird
64A
Arrived home, perhaps, for an Oriole
65A
Handle
66A
Vet ___
67A
Believe in them backwards and forwards!
68A
Passel
69A
"___ quam videri" ("To be, rather than to seem")
Down
1D
Procol ____ ('60s psychedelic rock band ("A Whiter Shade of Pale") named after a friend's cat, which is not a hint, just a neat factoid); or, ___-scarum
2D
Condiment also known as "rooster sauce"
3D
Longstanding cooking competition
4D
"But is it ___?" (Question asked by someone who isn't sure if a song is being sung by Mr. Garfunkel)
5D
ISO kin in the US
6D
"Congrats, Nigel"
7D
Sennacherib or Sargon, e.g.
8D
___ the moon (ploy in Hearts)
9D
React to fabulous news
10D
Budget parts
11D
They might be carried by Papá Noel
12D
Some Whirlpool products
13D
Was reminded of a workout, maybe
14D
Protect, in a way
22D
Brylcreem amount
23D
Says "Boo," maybe
25D
Coconut product
29D
Curved
31D
Some landforms
36D
It's all the buzz!
38D
"Two thumbs down"
39D
Times that ended in the 15th century, except for certain dinner theatres
40D
Goyim
41D
Species that live only in a particular location
45D
Twiddle, to use the technical term
46D
Mott the ___ ("All the Young Dudes")
47D
Replaces
50D
Title for Defarge or de Staëhl
52D
Cinematic partner for Frankenstein or Chucky
54D
Many women at Bletchley Park
56D
"In every wood shop, turn, turn, turn, there is a ____, turn, turn, turn" (forgotten verse from an old Byrds hit)