Zinger from the peanut gallery (9)

I believe the answer is:

wisecrack

(Other definitions for wisecrack that I've seen before include "Pithy remark" , "cause of mirth?" , "Ironic and/or witty quip" , "Dig" , "Witty remark; gag" .)

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

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