1. Prevents littering?
6. Kind of sandwich
10. Unruly bunch
13. Vinyl collectible, perhaps
14. Brainy Simpson girl
15. Pre-stereo sound
16. Discuss a situation
18. It's an OK city
19. Ogle
20. One teaspoon, maybe
21. Refinement
23. Storybook baddie
24. Liking
25. Aquatic mammal
27. Noisy parrot relative
30. Part of Iberia
31. Like a sheep's coat
32. Abbr. in car ads
33. Congers
34. Adhesive
35. Buttonhole, e.g.
36. Okla. adjoiner
37. Loses luster
38. Elephant goad
39. Relating to a Jewish leader's teachings
41. Light beam splitter
42. Baldwin & Guinness
43. Lunch choice, possibly
44. "Venice of Brazil"
46. Phyllis Diller's fictional hubby
47. Aged
50. Classes
51. Say it as it is
54. Be-boppers
55. Leaves home?
56. Buy alternative
57. Yoko from Tokyo
58. Air force heroes
59. Bottomless pit