Crossword Genius

Acerbic remark (4)

Ross

I think it could be either:

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4

3-4

barb

(Other definitions for barb that I've seen before include "Small prong on larger point" , "Twisted point of hook" , "Point of fish-hook - gibe" , "added to wire?" , "Jibe" .)

I've seen this clue in the LA Times.
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