1: Improvises like Ella

6: Crescent-shaped mountain range

10: Den of thieves

14: Earthling

15: Caroling song

16: Speedway competition

17: Ammonia compound

18: Extinct flightless bird

19: Bug-eyed

20: Crisp cookie

22: Lacking, along the Loire

23: Clock radio button

24: 'Shall we?' response

26: Extended and dramatic narratives

29: Feeling expressed in many a Woody Allen film

33: Strikes

37: Chimpanzee's hoot

38: Weird like Friday?

39: Multigenerational story

40: Game trap

42: A pink one means trouble

43: Monterrey dish

45: Like a fiddle?

46: Stuff to the gills

47: Party's candidates

48: Dividing membranes

50: SAT part

52: Used 'th' in place of 's'

57: Lewis Carroll's 'Jabberwocky' word for 'scratch, dog-style'

60: Accordion's relative

63: Cornerstone datum

64: Pretty good

65: Canine kin

66: Perth pal

67: Marshes

68: Smart guy

69: Roe source

70: Sigma Nu, for short

71: They’re often out on a limb

1: Thick carpets

2: Aromatic herb

3: Part of PABA

4: 'Last ___ in Paris'

5: React to pollen, perhaps

6: 'No ifs, ___, or buts!'

7: Bird with an eerie call

8: Participates in the Tour de France

9: Skiing area

10: Insensitivity

11: Indian music

12: Computer signpost

13: Bums change

21: Restfulness

25: Ancient mariner

27: Cyclotron bit

28: Rub the wrong way?

30: Festive affair

31: Revue segment

32: A or B, in personalities

33: Uses a bookie

34: October birthstone

35: Strong cotton

36: Dispersed

38: State of fitness

41: Lambaste

44: 'I'm Sorry' singer Brenda

48: 'Dracula' author Bram

49: Wiley Post, for one

51: Pooh-pooh, with 'at'

53: Mink wrap

54: Mounds

55: Represent onstage

56: Some ales

57: Workout sites

58: 'You betcha!'

59: ___-tat

61: Grandmother, affectionately

62: Dermatologist's concern