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"launder" is also used as a crossword clue. If that's what you saw, the answer is often wash (4 letters).
Definitions
convert illegally obtained funds into legal ones
Word origin
Contracted from Middle English lavender, from Old French lavandiere, from Late Latin lavandera, from Latin lavō (“to wash”).
Used in a sentence
“Oft did she heave her napkin to her eyne, / Which on it had conceited characters, / Laundering the silken figures in the brine”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Wash clothes”7 letters
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