Crossword Genius

Parts of butchered buffalo first couple rejected? (5)

Ross

I believe the answer is:

offal

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'parts' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for offal that I've seen before include "Less edible parts of animal, entrails and organs" , "Inner organs used for food" , "Entrails used as food" , "cheap meat" , "Animal entrails and internal organs as rubbish" .)

I've seen this clue in The Daily Mail.
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