Crossword clue with a question mark, frequently (3)

I believe the answer is:

pun

(Other definitions for pun that I've seen before include "A play on words - not the height of wit" , "Humorous wordplay" , "A play on words, may be funny" , "A play on words, perhaps the lowest form of wit" , "Humorous play on words" .)

I've seen this clue in The Wall Street Journal.

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