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 King Feature Syndicate, the Evening Standard, The Guardian, The Wall Street Journal, the Penny Press, the LA Times, The Star Tribune, The Mirror and The Irish Independent.
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