Crossword Genius

Compound rate's void in Ukraine (4)

Ross

I believe the answer is:

urea

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'compound' is the definition.
(urea is a kind of compound)

I can't explain the remainder of the clue.

Can you help me to learn more?

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

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