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The most common and recent 4-letter answer for "Swamp thing" is REED.
The clue 'Swamp thing' suggests something commonly found in a swamp or wetland environment. Reeds are tall, slender-leaved plants that grow in such areas, making 'REED' a fitting answer.
This clue was last seen in the Washington Post Mini Crossword on September 30, 2025.
A reed is a tall, slender-leaved plant that grows in wetlands and marshes.
Clarinet part, Sax piece, Portland college attended by Steve Jobs, Part of a clarinet, Oboe piece

If you’ve landed here for the “Swamp thing” clue from the September 30 2025, Washington Post mini crossword, you are in the exact right place. Our team of experts has solved today’s entire puzzle and found the precise answer for this clue.

The 4-letter answer to this puzzle is REED. A reed is a tall, slender-leaved plant that grows in wetlands and marshes.

The clue 'Swamp thing' suggests something commonly found in a swamp or wetland environment. Reeds are tall, slender-leaved plants that grow in such areas, making 'REED' a fitting answer.

You can find all the solutions for today’s puzzle, as well as answers from previous days, on our main Washington Post Mini Crossword Answers Today (September 2026) page.

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