Crossword puzzle clue "that's director's we're done"

Source of the line "What's done is done"

"Done and done!"

"Done and done"

Director's "Done with this segment!"

"That's __!" (director's "We're done!")

Best Director of 1997, and Best Director nominee of 2009

Director of the first film to win all five top Oscars (Best Picture, Director, Actor, Actress and Screenplay)

Director who played a director in “This Is Spinal Tap”