Crossword Genius

Donkey to value fertiliser (7)

Ross

I believe the answer is:

nitrate

'fertiliser' is the definition.
(I've seen this before)

'donkey to value' is the wordplay.
'donkey' becomes 'nit' (both can mean a stupid person).
'to value' becomes 'rate' (both can mean to esteem).
'nit'+'rate'='NITRATE'

(Other definitions for nitrate that I've seen before include "salt" , "Fertiliser chemical" , "Tear tin up for fertiliser" , "Fertilizer" , "Natural or synthetic fertiliser" .)

I've seen this clue in The Guardian.
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