1. Repeatedly, to a bard
2. "Go team!"
3. Point of no return?
4. Headed
5. Kind of battery
6. Hydrocarbon derivative
7. Anagram of "liar"
8. Former French coin
9. Dollar portrait
10. Sort of ho-hum
11. Inquired
12. Old Spanish coins
14. Mortarboard attachment
18. Did away with, in a way
22. Cereal grain
23. Winged
24. End of the line, so to speak
25. [Yawn]
26. Camera feature
27. Big cheese, e.g.
29. Trattoria offering
30. Big name in crackers
32. Where to find a hero?
34. One who digs hard rock?
35. Fourth estate
37. Nominates, in a way
38. Tell's partner
40. Certain type of engraving
41. One of the Seven Dwarfs
43. Casual wear
44. Gab
45. Come down with
46. Dig, so to speak
47. Sidekick
49. Intensifies, with "up"
50. Give off, as light
53. Low digit
54. Child support?
55. "Bingo!"
56. Milk dispenser?
57. Long, long time