Theme: Epistles - Two across, two down, and one reveal.
17A. *Seeks shelter: TAKES COVER. Cover letter.
38A. *Bob Marley togetherness classic: ONE LOVE. Love letter.
11D. *System that gets goods to customers: SUPPLY CHAIN. Chain letter.
25D. *Major golf tournament won five times by Tom Watson: BRITISH OPEN. Open letter.
61A. Stationery that may include a company logo ... or what the ends of answers to the starred clues can be?: LETTERHEAD
Argyle here. C.C. puts us back on the path to crossword normalcy.
Across:
1. Like some benefit golf tournaments: PRO-AM
6. Baby bed: CRIB
10. Deadly snakes in hieroglyphics: ASPs
14. "It matters to me": "I CARE"
15. Italian money until 2002: LIRA
16. Tackle box item: LURE
19. Samoa's capital: APIA
20. "__ side are you on?": WHOSE
21. Not up to snuff: SUBPAR. But subpar might be good in the British Open.
23. Pierced ear part: LOBE
26. Actor Jared: LETO. Busy man. IMDb
28. Conceals in one's hand: PALMS
29. Tactical advancements: INROADS. Did You Know? Inroad is a combination of in and road, both of which are pretty mundane, as far as words go. But the first-and oldest-meaning of inroad hints at a meaning of road other than the "way for traveling" one. Beginning back in the days of Old English, road referred to an armed hostile incursion made on horseback. (Raid comes from this use of road and also formerly specified incursions on horseback.) Road has lost all of its former violent connotations, and inroad is shedding its as well. While inroads are often made at the expense of someone or something, they are at times simply advances, as when an artist is said to be making inroads into a community. ~ Merriam-Webster
31. Like slugs: SLIMY
33. Jellyfish bites: STINGS
34. Thrilla in Manila boxer: ALI
35. Stop stalling: ACT
37. Wee one: TOT
41. Mag mogul often seen in pj's: HEF. Hugh Hefner.
43. Letters in geometry: PIs. Pi for breakfast?
45. Duracell size: AAA
46. Ritzy spread: ESTATE. Oater for ranch.
48. Ivory and Coast, for two: SOAPS. Get it? Ivory Coast.
50. Tom Brady, notably: PATRIOT. Quarterback for the New England Patriots.
51. Garden bug: APHID
53. Airline to Tel Aviv: EL AL
55. "The Piano" actress Paquin: ANNA. (11 years old in the Piano, 1994)
56. "Just my luck!": "POOR ME!". Alas and alack.
58. La Scala solos: ARIAs
60. Prime for picking: RIPE
66. "Got it": "I SEE"
67. Dole (out): METE
68. Chill-inducing: EERIE
69. Camera part: LENS
70. Toboggan, e.g.: SLED
71. Second or sixth president: ADAMS. John Adams or John Quincy Adams.
Down:
1. Mango discard: PIT
2. Color TV pioneer: RCA
3. Sturdy furniture wood: OAK
4. "Is it a go for tonight?": "ARE WE ON?"
5. Sports jersey material: MESH
6. Wraps up: CLOSES
7. Fastener for Rosie: RIVET
8. Rancor: IRE
9. Pub crawl stops: BARS
10. Montgomery's home: ALABAMA. The state's capital; tricky clue.
12. Trojan War king: PRIAM. Whose side? Troy. (Hi, Agnes)
13. Chars: SEARS
18. Reason for a heating bill spike: COLD SNAP
22. Wire service org.: UPI. (United Press International)
23. Most wanted __: LIST
24. In the lead: ON TOP
27. Nobel Institute city: OSLO
30. Back in the day: AGO
32. Habitually misrepresent one's true self: LIVE A LIE
34. Pie __ mode: À LA
36. Wyoming's Grand __ National Park: TETON
39. Lighten (up): EASE
40. Md. winter hours: EST. Maryland/Eastern Standard Time
42. Spanakopita cheese: FETA
44. Evening affairs: SOIRÉEs
47. Seriously vandalized: TRASHED
49. USN bigwig: ADM. Navy Admiral
50. Took different paths: PARTED. Two roads diverged in a wood, and I -- I took the one less traveled by, and that has made all the difference. ~ Robert Frost
51. Month with showers: APRIL
52. Composure: POISE
54. Foamy pick-me-up: LATTE
57. Tall shade trees: ELMs
59. Environs: AREA
62. Slender swimmer: EEL
63. Pitcher's stat: ERA. (earned run average)
64. Asset at the archery range: AIM
65. __ Moines: DES
Argyle