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She avoids animal products with lead values exceeding generally acceptable norms (5)

Ross

I believe the answer is:

vegan

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

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

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(Other definitions for vegan that I've seen before include "one not using animals" , "Selective consumer" , "Avoider of animal products" , "One shunning animal products" , "Strict vegetarian" .)

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