Crossword Genius

Caustic remark (4)

Ross

I believe the answer is:

barb

'caustic remark' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for barb that I've seen before include "Thorn or spike" , "Insult" , "Kind of thorn or wounding remark" , "Hurtful witticism - on wire" , "Hook - gibe" .)

I've seen this clue in the Sydney Morning Herald.
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