ACROSS

 1 One to watch

 11 Minor untruth

 14 Connoisseur

 15 Not great, not terrible

 16 "Something's fishy"

 17 Coffee dispensers

 18 Gain's opposite

 19 Enchanted prince, perhaps

 20 Say hello to

 21 Insect that does in fact have knees

 22 Pencil case items

 24 Places to store sports gear

 28 Refusals

 29 Bonobo, e.g.

 30 Tough HS English course

 31 Where to find a green room?

 33 Bit of bird food

 34 Gives approval for

 36 "I accept your terms"

 37 It may involve the raising of tariffs

 39 "Use the ___, Luke"

 40 Sprinted

 41 Singer ___ C

 42 Less dense

 44 Good time for beachcombing

 46 Put a strain on

 47 More achy

 48 Family group

 50 Spot for a date?

 54 Beasts of burden

 55 "NOT true!"

 57 Peruse

 58 Room that may be kept at 55 degrees Fahrenheit

 59 Sound of disapproval

 60 Magic words spoken by Ali Baba

DOWN

 1 Commuting option

 2 "Were that the case ..."

 3 People in a computer game franchise

 4 Adds frosting to

 5 Zippo

 6 One seen on the green

 7 Catches in a trap

 8 Pacific root crop

 9 Campaign manager?

 10 Nonsense, to a Brit

 11 Hotheaded entertainers?

 12 What those on a yoga retreat may seek

 13 Author's dream

 15 Sometimes-faux garments

 20 Nasty cut

 21 Wager

 23 Down Under hoppers

 24 Option for when you're out of options

 25 Exclusive spots in a theater

 26 Complete separation

 27 Captain ___ (pirate)

 31 Musical ability

 32 Stench

 34 Was indebted to

 35 Healthy, crispy snack item

 38 Arab ruler

 39 Communication that may baffle millennials

 42 New York City's ___ Island

 43 Doesn't stay calm

 45 Look after

 49 Track assignment

 50 Buddies

 51 Milan's Teatro ___ Scala

 52 Hemsworth of "The Hunger Games"

 53 Trifling

 55 Number of syllables in "grammar"

 56 Word before "red" or "the light"