“Source of some flashbacks” crossword clue

Reveal the answer to see why it works and where this clue has appeared before.LSD is the answer to the New York Times crossword clue “Source of some flashbacks”. It was last seen in the puzzle of October 4, 2025, where it runs at 43 Down and fills 3 squares. It crosses 3 other entries in that grid — those are listed below and are the quickest way to confirm the letters you already have.