Crossword puzzle clue "word before across or down"

First word across in the first-ever crossword (1913) and the first of a dozen appearances of the word in this puzzle's grid, written word search-style (left, right, down, and diagonally) ... Can you f

Word before across or down

"Word that can appear before the starts of A-, B- C-, D- and E-Across" crossword theme, e.g.

Award won by lead actors in this puzzle's starred films: the winners' names are hidden "word search"-style in the grid (across, down or diagonally, and forward or backward)

Jumble wordplay applied to every Across answer except this one, yielding another word/word form

Word that can follow the last word of the three longest Across answers