NYT Crossword Tips
Tip: Use ? for unknown answer letters, e.g. AN??ER. Use the space bar to enter ? quickly.

Clue: "What 15-Down is ... or a hint to the answers to the four starred clues in left-to-right order"

"What 15-Down is ... or a hint to the answers to the four starred clues in left-to-right order" is a New York Times crossword puzzle clue that we have seen 1 time.
Possible answer
Recent usage in crossword puzzles