Crossword Genius

Cut (4)

Ross

(Other definitions for barb that I've seen before include "Sharp point; wounding comment" , "Sharp projection" , "criticism" , "nasty comment" , "Hurtful witticism - on wire" .)

I've seen this clue in the Penny Press, the Evening Standard, the LA Times, The Mirror, The Star Tribune, the King Feature Syndicate, The Irish Independent, The Guardian and The Wall Street Journal.
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