35A35ADunne of _I Remember Mama_[-----] or 59D59DSusan of _L.A. Law_[---], but not 60A60ABaldwin of _The Hunt for Red October_[----]
38A
Arboreal marker
40A
Greek island
41A
Check for deception?
42A
Düsseldorf-to-Dortmund dir.
43A
Show up for duty
46A
Tune for two
47A
Impartiality
49A
UN observer group
50A
Check for nature?
54A
Cruise stop
55A
Language suffix
56A
Rubbed out
60A
Baldwin of The Hunt for Red October
61A
Double curve
62A
Seed source
63A
One of nine in the South China Sea
64A
Newspaper, for Shortz
65A
Highest roll when checking for 1A1ACheck for perception?[------], 20A20ACheck for fortitude?[------------], 33A33ACheck for athletics?[--------], 41A41ACheck for deception?[--------], or 50A50ACheck for nature?[------------]
Down
1D
Important people have big ones, maybe
2D
Hard water?
3D
Bashful
4D
Frisbee, e.g.
5D
Black-and-white cookies
6D
AMs
7D
Pasadena inst.
8D
Self-critical remark
9D
Part of an arch and my one cheaty fill for this puzzle
10D
Aids in crime
11D
Four-ring four-wheeler
12D
___ Domini
13D
Die-hard fan, on the internet
21D
Narrow cuts
22D
Less attractive
23D
Lorraine's neighbor
24D
Canon correction
25D
No Exit playwright
28D
Opposite of buff, in gaming parlance
30D
Rolls out of bed
31D
Tooth covering
32D
Musically smooth
34D
Like machine learning networks
36D
Former Senate Majority Leader Harry
38D
52D52D38D, in Tijuana[----] and 57D57D38D, in Tianjin (and Tokyo, usually)[---]
39D
Cluttered room
41D
Clog up
44D
Girl that Dexys wants to come on
45D
Overly proper
47D
Slang that Gretchen should really stop trying to make happen
48D
Threaded fastener
50D
Apple tablet
51D
The Big Easy
52D
38D38D52D and 57D[-----], in Tijuana
53D
Simplicity
57D
38D38D52D and 57D[-----], in Tianjin (and Tokyo, usually)