Today’s Saturday Stumper

Today’s Newsday  Saturday Stumper is by Ben Zimmer. It’s solid, man, solid. Just three clue-and-answer pairs of note, the long and short of it:

8-D, fifteen letters, “Sci-fi staples.” And other office supplies?

34-A, fifteen letters, “DJ sound effects.” I’d think of them as music, not sound effects.

48-A, three letters, “His name is mud.” Ah!

My favorite in this puzzle: 47-A, four letters, “Dr. King’s ‘highest good.’

No spoilers; the answers are in the comments.