puzzle

 ACROSS

  1 Let up

  6 Adele's voice range

 10 "High Voltage" band

 14 "Take it easy!"

 15 Telly network, with "the"

 16 Sound from a fan

 17 "Go get it, Fido!" (note this answer's final 2 letters + ...)

 18 Totally trounces (... this answer's first 3)

 20 007 creator Fleming

 22 Figurehead's place on a ship

 23 Small criticism

 24 End of a relay race (final 3 letters + ...)

 28 End of an apple pie order (... first 2)

 30 Anger

 31 Slender swimmers

 33 Get the lead out?

 34 Flat-topped formations

 36 Brings together

 38 Most visited Hawaiian island

 39 Do penance

 40 Surprisingly, they can be even

 44 Poet Frost

 46 "B-o-r-i-n-g"

 47 Nannies or billies

 49 Moderate pace

 51 Pirate's beverage

 52 Have a thing for (final 3 letters + ...)

 54 Paper-folding art (... first 2)

 56 Beret, e.g.

 57 Billionaire Musk

 59 Zig instead of zag, say

 60 Bit of gossip (final 3 letters + ...)

 63 Note from a teacher (... first 2)

 67 "Take a ___ breath!"

 68 Adhesive on a roll

 69 Put into words

 70 "Como ___ usted?"

 71 Paradise

 72 Fusilli or rigatoni

DOWN

  1 Pound sound

  2 Spelling competition

  3 Bottom-row PC key

  4 Unspoken but understood

  5 Breathes out

  6 Civil War prez

  7 Long jump

  8 Fish with a neon variety

  9 Like the telegraph, nowadays

 10 Leatherworking tool

 11 Khaki pants

 12 Separate

 13 Island where Hercules captured a bull

 19 In the know

 21 Formerly named

 24 Short name for a long vehicle

 25 Length x width, for a rectangle

 26 Group gathering, slangily

 27 Butt muscle, briefly

 29 George ___ University

 32 Sty sound

 35 Ethereal glows

 37 Basic course

 39 Word before "zero" or "minimum"

 41 Nickelodeon explorer

 42 Keep the beat

 43 Big rig

 45 "A rose by any ___ name ..."

 46 Roils

 47 AA, A and B, for eggs

 48 Place for a plug

 50 Miner's quest

 52 Scold

 53 Wanderer

 55 Climate activist Thunberg

 58 "Uh-uh"

 61 Org. that regulates emissions

 62 Villainous Kylo

 64 UFO pilots

 65 NYC opera venue, with "The"

 66 1923 National Women's Party proposal, briefly

solution