ACROSS

 1 Big bunch

 5 Tibetan holy men

10 Hide-working tools

14 Melange

15 Academy, in Arles

16 Accomplish flawlessly

17 Detox candidate

18 Homebound student, often

19 It's a thought

20 Like a snap decision

23 Curly-leafed, mustard family members

24 Change location

25 Ample amount

28 Ticked states

30 Angel costume accessory

31 Kind of down

33 Afternoon snooze

36 Very quickly

40 "The Ipcress File" author Deighton

41 Projecting window design

42 On the high side, as a guess

43 Bit for Miss Muffet

44 Superlatively scant

46 Tijuana cash

49 Sacred song

51 On very short notice

57 Continental currency

58 Spokes

59 "Reader's Digest" co-founder Wallace

60 Hebrew month

61 April 1 baby, e.g.

62 Climber's impediment

63 Colorful amphibian

64 Dough raiser

65 Pinings

DOWN

 1 Females with pig tails?

 2 Cut out, as coupons

 3 Aboriginal Japanese

 4 Opening necessity?

 5 Didn't hold back

 6 Less than 90 degrees

 7 Emperors in the closet?

 8 On the protected side

 9 Appear

10 Hostile attitude

11 A bird that walks in water

12 Claims upon property

13 Election Day list

21 Cereal grass

22 "La Boheme," e.g.

25 Baseball Hall of Famer Rizzuto

26 Olympic swimmer's path

27 Flair

28 Person on a pedestal

29 Zebra on the court, briefly

31 Wife of Geraint, in Arthurian lore

32 Likable prez?

33 Upper part of a glacier

34 Affirmative votes

35 Chic or cheeky

37 Adult nit

38 Abbr. on a clothing sale item, sometimes

39 State of being regular or common

43 Accomplice

44 "Little Red Book" follower

45 Santa staffer

46 Song of tribute

47 Exercise by Chopin

48 Backbreaker, in a proverb

49 Lecture-hall platforms

50 Bond and Bourne, for two

52 Heavy horsecart

53 "Still mooing," at a steakhouse

54 Add to the payroll

55 Ladd or Thicke

56 Auto plates