A race finish? (6)

I believe the answer is:

polish

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This could be a double definition.

'a race' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'finish?' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for polish that I've seen before include "Perfect" , "Europeans" , "Rub until shiny" , "A West Slavic language" , "See 1" .)

I've seen this clue in the Evening Standard.

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