Crossword Genius

In this way, one can see stars (5)

Ross

I believe the answer is:

milky

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'in' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

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

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(Other definitions for milky that I've seen before include "White, opaque" , "Lacteal; cloudy" , "Of a soft white colour" , "Clouded" , "Lactic" .)

I've seen this clue in the Evening Standard.
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