puzzle

 ACROSS

  1 Top worn under a blouse, for short

  5 "Are you chicken?" taunt syllable

  9 Reject unexpectedly

 13 Impulse transmitter

 14 Sans serif font

 15 ___ Thins (certain cookies)

 16 Advantage

 17 Reason to sue a bakery?

 19 End of an Italian sonnet

 21 Blue-green shade

 22 Instrumental music pieces

 25 They deliver punches

 29 Exceeded one's balance

 31 Giggle sound

 32 Free-for-all fight

 33 Give a makeover

 35 Katy Perry hit with a jugle-themed music video

 36 Id's counterpart

 37 Course hinted at by this puzzle

 40 Lao-___

 41 Zeus and Poseidon

 43 (Come on, pet me!)

 44 Mature, as fruit

 46 Zeros

 48 Nail polish session

 50 Sirloin steak source

 51 Dressed down

 52 McEntire of country

 54 Pearl Jam frontman Eddie

 57 Sweet indulgence during Lent?

 62 Michelin product

 63 Cambodia's continent

 64 Chippendales dancers, e.g.

 65 City in Oklahoma

 66 "___ I was your age ..."

 67 Colors

 68 A long, long time

DOWN

  1 WHAT THIS CLUE IS WRITTEN IN

  2 Wheel rod

  3 Fraternal organization for chocolate lovers?

  4 Coming down the pike

  5 Dude

  6 Beach ball filler

  7 Lightbulb units

  8 Painter whose name sounds like "clay"

  9 More like Santa

 10 Lyricist Gershwin

 11 Hula accessory

 12 Quarterback Brady

 14 Fragrant oil

 18 Place to order a latte

 20 Came to a close

 23 Abrupt

 24 "That's great!"

 26 Track star's treat?

 27 Short trailer

 28 Peaceful

 29 Final letters, in Athens

 30 Sit in front of the TV

 31 The Blue Jays, on scoreboards

 34 Scotch whisky name

 38 "Miami" has two of them

 39 Cliche

 42 LA's ___ Oaks

 45 Cold drink for a hot day

 47 ___ bien

 49 Congregation settings

 51 African language group

 53 Rose plant

 55 Great Lake with the shortest name

 56 Cincinnati MLB team

 57 Furry foot

 58 Blond shade

 59 Tell a whopper

 60 Expected

 61 YouTube annoyances

solution