These people can set a shining example (6)

I believe the answer is:

polish

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'example' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Other definitions for polish that I've seen before include "Shine up the nationality" , "Gloss - refinement" , "Rub - European" , "Shine with cloth,buff" , "taught in finishing school?" .)

I've seen this clue in the Evening Standard.

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