Shows polish (6)

I believe the answer is:

gleams

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'shows' is the definition.
The definition and answer can be both related to natural events as well as being 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 gleams that I've seen before include "Brief showings of soft light" , "Shines brightly" .)

I've seen this clue in the Evening Standard.

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