The word "missort" refers to a verb meaning to incorrectly or mistakenly organize or categorize something. In the context of the clue "File a Led Zeppelin album under Z, say," it suggests placing a Led Zeppelin album in a incorrect location based on a misguided approach of organizing alphabetically.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: File a Led Zeppelin album under Z, say. Explanations are generated by AI and may be inaccurate.