People who polish ornamental wood (7)

I believe the answer is:

sanders

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'people' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sanders that I've seen before include "Wallace set by West African river" , "Abrasive tools" , "Tree" .)

I've seen this clue in The Sunday Times and The Times.

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