Crossword Genius

Organic matter in soil (5)

Ross

I believe the answer is:

humus

'organic matter in soil' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for humus that I've seen before include "Decomposed vegetation" , "Rich organic material from dead leaves, plants etc" , "Organic matter in topsoil" , "Compost" , "Organic stuff" .)

I've seen this clue in The Independent, The Times and The Guardian.
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