Across
1 Powers
5 Cops in much of Europe
8 Online rule
9 Body named for a national park
10 Studio
11 Vigevano
14 1940 song, sort of
15 Triangle
16 Partner killer
17 Value of a question
19 A strike
20 Tanakh program
21 A lot is over this
Down
1 Odds
2 Call Chidi
3 A cube's square
4 1982 hit
5 NIN song
6 1919 play
7 Dr. Pepper's
12 Depth
13 2008 show
17 A position
18 Answer