Substance with a low pH (4)

I believe the answer is:

acid

'substance with a low ph' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for acid that I've seen before include "It is neutralised by alkali" , "Drug, tart" , "Cutting" , "It is neutralized by alkali" , "Corrosive substance" .)

I've seen this clue in the Universal, the Sydney Morning Herald and the USA Today.

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