A star, for instance, gets the best part (9)

I believe the answer is:

highlight

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'a star' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for highlight that I've seen before include "Outstanding feature" , "Emphasise" , "Climax" , "Emphasize" , "the moon?" .)

I've seen this clue in the Evening Standard.

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