A more common term for potassium carbonate (6)

I believe the answer is:

potash

(Other definitions for potash that I've seen before include "Caustic stuff" , "The strange pathos of a potassium compound" , "Compound used in agriculture and industry - shop at (anag)" , "Pathos (anag)" , "Powerful alkali from burnt wood" .)

I've seen this clue in The Times.

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