Puzzle

 ACROSS 

1 Make a meal of

  5 Physics particle

  9 Informal "What if ..."

 14 Wicked

 15 Small string ensemble

 16 HBO host Bill

 17 Repetitve learning

 18 Soft powder

 19 Prefix for "Saxon"

 20 Comedian in "Black-ish," after being "nationalized"?

 23 U.K. reference work

 24 When Daylight Saving Time starts

 25 Seat of power

 27 ___ tai

 29 "That's more like it!"

 32 Chose from a lineup, briefly

 33 Airline until late 1991

 35 Keto and Paleo

 37 '80s tennis champion, after being "nationalized"?

 43 Headquarters for Panasonic

 44 Pessimistic sort

 45 Mechanical pencil need

 48 Illuminated like old streets

 51 Rest one's feet

 52 Trouser measurement

 54 Designer Mizrahi

 56 Ones who right words?: Abbr.

 57 "Love Story" co-star, after being "nationalized"?

 62 Rainer of "The Great Ziegfeld"

 64 Book series with object-filled pictures

 65 Prefix for "nautical"

 66 Choir accompaniment

 67 British brews

 68 Sneak a look

 69 Makes (one's way)

 70 Second take, say

 71 Reaches a conclusion

DOWN

  1 Mister, in Munich

  2 Openly confess

  3 Nutrient found in carrots

  4 Justice Kagan

  5 Include in an email

  6 Like some lowbrow novels

  7 Slick to the touch

  8 Parody

  9 Powerful table tennis shot

 10 Low-tech fryer?

 11 "Phew!"

 12 Moon goddess

 13 Ate away

 21 Shows such as "Game of Thrones"

 22 Singer Merman

 26 Like inves-ting all your money in one stock

 27 City or highway stat

 28 Ooh's partner

 30 Ferber and St. Vincent Millay

 31 Give a hand to

 34 Battery terminal

 36 Breath mint brand

 38 Underground rock

 39 Alias initials

 40 In a sitcom, say

 41 Roman seven

 42 Part of a play

 45 Try to go unnoticed

 46 Stand the test of time

 47 Give, as a task

 49 Walked with difficulty

 50 Parent's words after "because"

 53 Prayer enders

 55 Open with amazement

 58 One who should fail a polygraph test

 59 Small, sandy spot

 60 Ran ___ light

 61 Chinese cookers

 63 Feeling :-(

Solution