puzzle

 ACROSS

  1 ___ sum

  4 Didn't get the ___

  8 Dirty looks

 14 Big heart?

 15 Accepting customers

 16 Harry and Meghan's firstborn

 17 Due date

 19 Pour, as wine

 20 Genetic matter that Rosalind Franklin studied (Hint: This answer includes part of 4-Down)

 22 Avoids a dodgeball

 23 Verbal hesitations

 24 Ready to clock in

 26 Cartoon fawn

 29 Golfer's benchmark

 30 Chore

 33 Commotion

 34 E.R. worker

 37 Blocky blokes?

 39 Detroit Lions' org.

 40 Bathroom, in Birmingham

 41 Post-op stop, maybe

 42 Mined find

 43 Component of a teacher's interview (... includes part of 28-Down)

 45 Letters before an alias

 46 Rapper ___ Kim

 47 Meeting, in slang

 48 ___ it on thick

 50 Chin dimple

 52 Late '90s hit whose title is sung before "beneath the milky twilight"  

54 Eastern "way"

 55 Word after "foot" or "finger"

 57 Sitting duck

 61 Stoves with ovens

 63 Children's book that opens with "UP PUP Pup is up"

 65 "Denver" diner dish

 66 First-year J.D. student

 67 Bearded antelope

 68 Great distress

 69 Either lead spy in "The Americans" (... includes part of 38-Down)

 70 Sink in the middle

DOWN

  1 Papa's partner, perhaps

  2 Cooled with cubes

  3 Statistical average

  4 They may "turn into" mountains

  5 Sweeping sagas

  6 Wine list accompaniment

  7 Swimmer's single circuit

  8 Glum

  9 Words to live by

 10 Dawn on

 11 Carnival game represented in this puzzle

 12 Clickable text

 13 Becomes solid

 18 Smear of paint

 21 And others, in a bibliography

 25 Total, as a car

 26 Cake and Blondie

 27 Something inflated for the Super Bowl?

 28 Certain upscale notebooks

 31 Font flourish

 32 Protested during the national anthem

 35 Swimming spots

 36 Unheard of?

 38 Spread that often costs extra at Chipotle

 44 Roof tile

 49 "Sure, sure"

 51 Student debt source

 53 Take the wheel

 54 Laid-back, personality-wise

 55 Seniors' dance

 56 Malek of "Mr. Robot"

 58 Album track

 59 "Final Fantasy" and others, briefly

 60 Hawaiian coffee district

 62 Pig's place

 64 Flat-faced pooch

solution