Crossword Genius

Nitrogen-rich compound used as fertiliser (4)

Ross

I believe the answer is:

urea

(Other definitions for urea that I've seen before include "Waste matter" , "Waste material" , "It's produced by piddling" , "organic compound" , "Compound found in urine, synthesised as a fertiliser" .)

I've seen this clue in The Guardian.
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