Crossword puzzle clue "write in any of this puzzle's eight theme answers"

Write in any of this puzzle's eight theme answers?

"To write is to write is to write . . ." writer

"The wart stops here" product, and a hint to the theme found in eight puzzle answers

Some film credits, and the idea behind the eight theme answers in this puzzle

Brief version of this puzzle's title hidden in eight long puzzle answers

Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)

Any eight-armed or eight-legged creature

"You have got to be kidding!" (or a hint to solving eight theme answers)