Crossword Genius

One knows about soil damaging to organism (10)

Ross

I believe the answer is:

agronomist

'one knows about soil' is the definition.
(agronomy is the science of soil management)

'damaging to organism' is the wordplay.
'damaging' is an anagram indicator.
'to'+'organism'='toorganism'
'toorganism' is an anagram of 'AGRONOMIST'.

(Other definitions for agronomist that I've seen before include "Farming expert" , "Crop specialist" , "occupation for expert on land" , "Crop expert" .)

I've seen this clue in The Telegraph.
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