Flippant gibe or sardonic remark (9)

I believe the answer is:

wisecrack

(Other definitions for wisecrack that I've seen before include "Smart remark" , "Ironically witty remark" , "Witty comment" , "Ironic and/or witty quip" , "Pithy remark" .)

I've seen this clue in The Mirror.

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