Crossword Genius

Main parts took no odd orange dye (6)

Ross

I believe the answer is:

anatto

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'dye' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for anatto that I've seen is " Orange colouring".)

I've seen this clue in the Sydney Morning Herald.
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