Extreme bitterness or malice (7)

I believe the answer is:

vitriol

(Other definitions for vitriol that I've seen before include "Sulphuric acid or caustic criticism" , "Sulphuric acid; malicious criticism" , "Bitter criticism" , "Sulphuric acid or savage criticism" , "Extreme malice" .)

I've seen this clue in The Mirror.

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