Crossword Genius

Caustic (4)

Ross

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4

7 5*

'caustic' is the definition.
(synonyms)

This is all the clue.

(Other definitions for acid that I've seen before include "It is neutralised by alkali" , "Tart - keen - sort of house party" , "Substance with pH of less than 7" , "Drug, tart" , "Morose" .)

I've seen this clue in The Independent, the Penny Press and the Newsday.
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