Puzzle

 ACROSS

  1 ___ up (common palindrome)

  4 Computers with Finder

  8 Like this answer

 14 Sound of satisfaction

 15 "This can't be good!"

 16 Everest expert

 17 Scot's refusal

 18 Small setback

 20 Heavy instruments in marching bands

 22 You: Fr.

 23 Bangalore bread

 24 Small piece of paper

 25 Sore, perhaps

 27 Best part of the weekend, for some

 32 Consumer protection org.

 34 "Be right with you"

 35 Give off

 36 Site of a siege to remember

 38 Quite proficient

 39 Headey of "Game of Thrones"

 40 Cousin of a clam

 45 Code breakers' org.

 46 Hogwarts class about nonmagical beings

 49 Fanciful thoughts

 50 Communicate nonverbally

 53 Betty of old cartoons

 55 Neither's partner

 56 Political debate topic

 57 Alley targets

 60 Pampering, for short

 61 Available to chat, say

 62 Morales of "Titans"

 63 Animal hidden in "Immanuel Kant"

 64 Amount prescribed

 65 Word after "sleep" or "national"

 66 Blog feed initials

DOWN

  1 Huffs and puffs

  2 Do-it-yourself moving rental

  3 Explosive start?

  4 Fall flowers, briefly

  5 ___ tuna

  6 Hold

  7 Chasing away

  8 Eruption fallout

  9 Bar exercise

 10 Pulled from shelves

 11 Sea creature with no natural predators

 12 ___ sugar

 13 Gunk on a trunk

 19 Beatles drummer Starr

 21 Imitate

 25 Mom-and-pop org.?

 26 Good times

 28 However, informally

 29 "Preach it, girl!"

 30 Jar contents at a restaurant

 31 Jones or James of jazz

 32 Skin soother

 33 Cordon ___

 37 Mississippi's state flower

 38 Krieger of the U.S. women's national soccer team

 40 NYC art museum, with "The"

 41 Employing

 42 Bent over

 43 Early daily occurrence

 44 Red pencil users, briefly

 47 Taking great strides

 48 Count conclusion?

 51 Shore birds

 52 Guitar parts with frets

 53 Pro ___ (for free)

 54 Barn birds

 56 "That so?"

 57 Gym figure

 58 Born, in the society pages

 59 Seize suddenly

Solution