Crossword Genius

Nail ____ (4)

Ross

(Other definitions for barb that I've seen before include "Insult" , "Hurtful witticism - on wire" , "Kind of thorn or wounding remark" , "Arrowhead projection" , "Backward projecting point of an arrowhead" .)

I've seen this clue in The Telegraph, the Penny Press, the Evening Standard and The Star Tribune.
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