Theme: the number 24
Clues
1. Toppers for Scottish laddies' noggins
5. Clarifying phrase
9. Chip off the old silicon block? (abbr)
13. Where to gamble on a Portuguese-Chinese fusion
14. Arctic circle's nomadic bunch
15. Spicy, but not for sensitive palates
16. Cut to the chase with motorized teeth?
18. Repeated cries for help, in brief
19. Salmon that's not quite ready for the big leagues
20. 2400
22. Sesamum indicum
24. Single-channel sound, or a nasty bug
25. It takes 24 of these to make 53 down pure
28. Holy shirt for the devoted dresser
30. Wound up like a clock's innards
33. sun god; counterpart of Akkadian Shamash
34. Plural bubbles on ancient seals
36. Religious TV network
37. Geomteric objict with 24 square faces
39. Spinster's card game or cleaning tool
41. NWS uses this when tornados are nearby
42. Famous race that lasts 24 hours
44. How Pierre might answer le telephone
45. Shorthand expert's shortened moniker
47. Baby blocker placed inside
48. Probable king oif Denmark in 624. Kinsman of Beowulf
49. US Supreme Court Chief Justice, 1924
51. Picture puzzle that's worth a thousand words
53. Burner that fuels the chef's fire (two words)
56. Shocked silly, like a specter
60. Free Willy's species
61. Peaceful tools from swords, biblically speaking
63. Faithful to a fault, in ye olde tongue
64. Doing nothing, like a car in neutral
65. Santa's little helpers or Keebler's cookie crew
66. Gentle touches or flatfish finds
67. Speaker of the US House of Representatives, 1824
68. Pig's dinner or sloppy joe filling
1. Himalayan wild goat with a woolly coat
2. Berry trendy superfood
3. Postman's burden of communiqués
4. This happens once every 24 hours
5. Odds are this is a chancy group (abbr)
6. Lumber-cutting plant that's a real buzz
7. Free online number checker
8. An indepedent type of disease
9. Toxic gas that's no laughing matter
10. Civil parish in Funchai, Maediera
11. Sets bloody standards for WHO
12. Unwanted growth that's not quite assist
13. In short, one millionth of a gram
17. Japanese change or Thai coin
21. Observed or well-known, in short
23. Abbreviation for a mile when at sea
25. With "the," afflicted with an affected coyness
26. Where one dined
27. Potato affliction caused by a species of Streptomyces
29. Fair-haired fun, perhaps?
31. Motionless or moonshine maker
32. Phrase commonly paired with with "the road" or "my rope."
34. This counts backwards from when times became common.
35. Lou Gherig's Disease
38. Where farmers sometimes store hay
40. US Supreme Court Chief Justice, 1824
43. Halo for a holy head
46. Nosey sounds in phonetics
48. Tycoon Howard, born on December 24, 1905
50. Subject matter at hand
52. Degrees earned by some non-scientists
53. It takes 24 of 25 across to make this pure
54. Space to fill or field of study
55. A kind of bad cholesterol (abbr)
57. UK aircraft manufacturer of the Lancaster and the Vulcan, for example
58. Slowly leak like a lazy faucet
59. abbr, killer of puppeteer Henson
62. Old English weight that's not far from way