Crossword Genius

Human waste product used as a fertiliser (4)

Ross

I believe the answer is:

urea

(Other definitions for urea that I've seen before include "Compound found in urine, synthesised as a fertiliser" , "Waste product of mammals" , "Human waste product" , "wee substance?" , "It's produced by piddling" .)

I've seen this clue in The Guardian.
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