Burning; sarcastic (7)

I believe the answer is:

caustic

This clue is a double definition.

'burning' is the first definition.
(thesaurus)

'sarcastic' is the second definition.
(thesaurus)

(Other definitions for caustic that I've seen before include "Scathing" , "Burning, corrosive" , "Burning - cutting" , "Corrosive - cutting" , "Acrimonious - sarcastic" .)

I've seen this clue in The Times.

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