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Vitriol (4)

Ross

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4

5 4,7

'vitriol' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for acid that I've seen before include "Bitter substance" , "It is neutralised by alkali" , "See 4 Across" , "Opposite of alkali; sour" , "something sharp" .)

I've seen this clue in the Universal, The Washington Post and the King Feature Syndicate.
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