Creature allegedly ingesting waste product (4)

I believe the answer is:

urea

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'waste product' is the definition.
(compound in urine)

'creature allegedly ingesting' is the wordplay.
'UREA' is hidden within the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

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

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