Crossword Genius

Fertilizer made from grass when hot (6)

Ross

I believe the answer is:

potash

'fertilizer' is the definition.

'grass when hot' is the wordplay.
'grass' becomes 'pot' (cannabis).
'when' becomes 'as'.
'hot' becomes 'h'.
'pot'+'as'+'h'='POTASH'

'made from' is the link.

(Other definitions for potash that I've seen before include "Compound used in agriculture and industry - shop at (anag)" , "Type of fertiliser" , "field dressing" , "Alkali used as fertiliser" , "Alkaline compound" .)

I've seen this clue in The Telegraph.
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