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"wit" is also used as a crossword clue. If that's what you saw, the answer is often wag (3 letters).
Definitions
Quick intelligence expressed with clever humour.
Word origin
From Middle English wit, witt, wyt, from Old English witt (“mind, sanity, sense, understanding”), from Proto-West Germanic *witi, from Proto-Germanic *witją (“knowledge; reason; wit”), from Proto-Germanic *witaną (“to know”), from Proto-Indo-European *wóyde (“to know”), from *weyd- (“to see”).
Used in a sentence
“He's gone completely out of his wits.”
“Keep your wits about you.”
“Where she has gone to is beyond the wit of man to say.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Quick mind”3 letters
02“Clever humor”3 letters
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