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"jester" is also used as a crossword clue. If that's what you saw, the answer is often fool (4 letters).
Definitions
a professional clown employed to entertain a king or nobleman in the Middle Ages
Word origin
From Middle English gestour; equivalent to jest + -er.
Used in a sentence
“As resident jester at the maverick journalism outlet The Free Press, Nellie Bowles scours the news for the absurd and hypocritical, and then skewers the best of the worst in her column, TGIF.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Court fool”6 letters
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