Crossword Genius

Fertiliser type (7)

Ross

I believe the answer is:

compost

(Other definitions for compost that I've seen before include "Fertiliser (from heap or bin)" , "Decomposed vegetable matter used as fertilizer" , "Mixture of decaying matter added to soil" , "Garden fertiliser" , "Growing medium" .)

I've seen this clue in The Mirror.
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