Having a low pH (6)

I believe the answer is:

acidic

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

This is all the clue.

(Other definitions for acidic that I've seen before include "Containing a sour-tasting substance" , "Tasting sharp or sour" , "Unpleasant" , "Cutting" , "Sour; bitter" .)

I've seen this clue in The Wall Street Journal, the Sydney Morning Herald, The Times and the King Feature Syndicate.

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