Crossword Genius

Potassium compound used as fertiliser (6)

Ross

I believe the answer is:

potash

'potassium compound used as fertiliser' is the definition.
(I've seen this before)

This is the entire clue.

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

I've seen this clue in The Irish Times.
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