Crossword Genius

Brownish colour of a deteriorated silver piece (5)

Ross

I believe the answer is:

liver

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'piece' is the definition.
(liver is a kind of piece)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for liver that I've seen before include "Internal organ" , "Bodily organ" , "Human organ" , "Abdominal organ" , "Large organ in the abdomen secreting bile" .)

I've seen this clue in the Evening Standard.
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