Today’s Saturday Stumper

Today’s Newsday Saturday Stumper, by Erik Agard, looked impossible to me. After fifteen minutes or so, I had a grand total of six answers filled in before a plausible answer to 4-Down, eight letters, “Soy protein, in some recipes,” popped into my head. And that answer opened up the puzzle.

Four clues that I especially liked, all with ten-letter answers: 1-Down, “Blood-chilling locales.” 2-Down, “Workplaces with score keepers.” 28-Down, “Line between pants.” 29-Down, “American family structure.”

And one more: 11-Down, six letters, “__ Four (Monkees nickname).”

No spoilers; the answers are in the comments.