puzzle

 ACROSS

  1 "Arrival" actress Amy

  6 "However ..."

  9 Professional poser

 14 Trouble continually

 15 2019 Women's World Cup champs

 16 Come up

 17 Summer weather measure (In this clue's answer, see the first 2 letters + the last 1)

 19 Scurries

 20 Commanded

 21 Candy that reacts with Diet Coke

 22 Backside

 23 "Eureka!"

 25 Risque

 26 Noted educational YouTube channel (... first letter + last 4)

 30 American Red Cross founder Barton

 34 "Outfit of the day" shot, e.g., briefly

 35 Lean

 36 One making many tough calls

 39 Shaken instruments

 41 Graceless people

 42 Contend

 44 The Joker, to Batman

 45 Breaded Italian-American dish, informally (... first 2 letters + last 3)

 49 Mar

 50 Whiz

 51 End table fixture

 55 Most G-rated

 57 Titular woman in a Simon & Garfunkel hit

 59 Corrosive substances

 60 Captivate ... or what three indicated words do, vis-a-vis 17-, 26- and 45-Across?

 62 Boat sometimes made of bark

 63 Family

 64 Implored

 65 ___ boson (elementary particle)

 66 "However ..."

 67 Like flexible straws


DOWN

  1 Detest

  2 Big name in tractors

  3 Carne ___

  4 39.37 inches

  5 Sauce recipe instruction

  6 Religious title that means "awakened one"

  7 Manipulate

  8 Wealth ___ (economic policy)

  9 Got by somehow

 10 Primate with reddish fur

 11 Cajun dish containing ground meat

 12 This, in Spanish

 13 It's more, they say

 18 Close by

 21 Hajj city

 24 Egyptian snake

 26 Give it some gas!

 27 He/___ pronouns

 28 Poetry competition

 29 Craft site

 30 Shoe customized with Jibbitz

 31 Activist Remini

 32 Validating

 33 Canine given a new home

 37 Track meet part

 38 A, in German

 40 Stage of deep sleep: Abbr.

 43 Org. that tests disinfectants

 46 Comes face-to-face with?

 47 One may go on a letter

 48 Old movie holder

 51 Cuba ___ (cocktail that could aptly be free)

 52 Straighten

 53 Dug up

 54 Flooded grain field

 55 Dash dial that anagrams to "chat"

 56 Berry in some smoothies

 58 Caveman's weapon

 60 Word before "writing" or "light"

 61 Flaky dessert

solution