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Acid's opposite (6)

Ross

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6

alkali

'acid's opposite' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for alkali that I've seen before include "Compound like lime" , "Opposite of acid" , "In pH terms, not acid" , "Substance turning litmus paper blue" , "Acid-neutralising substance" .)

I've seen this clue in the King Feature Syndicate and the Newsday.
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