puzzle

 ACROSS



  1 Common fast-food side order

  6 So far

 11 Backstabber

 14 Middle meal

 15 Montoya in "The Princess Bride"

 16 "A likely story!"

 17 Inedible fruit that surprisingly isn't a citrus

 19 Anger

 20 Cleopatra's snake

 21 Bit of aerobic exercise

 22 Up-and-coming whiz

 24 "Let's see you do better!"

 26 Split, like a hoof

 27 "For ___ a Jolly Good Fellow"

 28 Former legal drama that starred Susan Dey

 29 Howled

 32 Metaphor for a potential crisis

 35 Extol

 36 Line with triangles, on a weather map

 38 Before long, to a poet

 39 Become established

 41 The way things are going

 42 Track shapes

 43 Big name in outdoor gear

 44 New York NBA team

 45 Candor

 49 Pooh's pink pal

 50 Monotonous routines

 51 One may be short-sleeved

 52 John, in England

 53 Contents of some palettes ... or what 17-Across, 11-Down and 31-Down could be, given that their starts are rivers?

 56 Bird that hoots

 57 High up

 58 Not throw away, say

 59 Person celebrated in June

 60 Abominable snowmen

 61 Construction spots

DOWN

  1 Ice-cream treat served with a straw

  2 Rene of "Ransom"

  3 Like "Candy Crush" purchases

  4 Heart record, for short

  5 Relative of a man cave

  6 Buenos ___

  7 Lose your temper

  8 Yang's counterpart

  9 Baba ghanoush ingredient

 10 Initial bit of progress

 11 Drink such as liebfraumilch

 12 Composer Copland

 13 Not us

 18 Elevator pioneer

 23 Saint of Hollywood

 25 Lucifer

 26 Extended family

 29 Its first letter doesn't stand for "bread"

 30 Battery size

 31 Potato variety developed in Canada

 32 You may bid or build on it

 33 Oui's opposite

 34 No ___ in sight

 36 "Pecos Bill" or "Paul Bunyan"

 37 "Friends" character with a Ph.D.

 40 Saratoga or Daytona

 41 Stretching muscles

 43 Campus military org.

 44 Southern Plains native

 45 What the truth does, per Lizzo

 46 "I'm a little teapot/Short and ___"

 47 Brusque

 48 Affirmatives

 49 Trudge

 50 Mortgage change, for short

 54 Pampered one?

 55 Fragrant neckwear

solution