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...