Crossword Genius

Chemical mixed at shop (6)

Ross

I believe the answer is:

potash

(Other definitions for potash that I've seen before include "Potassium compound used in agriculture and industry" , "Caustic stuff" , "Potassium carbonate or hydroxide" , "Alkali used as fertiliser" , "chemical compound" .)

I've seen this clue in The Sun.
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