They aren't all named Giles! (7)

I believe the answer is:

farmers

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for farmers that I've seen before include "Agronomists" , "Cultivators of land" .)

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