Crossword Genius

Caustic Tim Vine? (7)

Ross

I believe the answer is:

pungent

'caustic' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for pungent that I've seen before include "Incisive" , "bitter" , "Witty" , "Penetrating" , "Acrid; sarcastic (humour)" .)

I've seen this clue in The Independent.
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