Is such a star there to be entertained? (5)

I believe the answer is:

guest

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'entertained?' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

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

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(Other definitions for guest that I've seen before include "One receiving hospitality" , "Recipient of hospitality" , "Visitor, lodger" , "Caller" , "One who's invited" .)

I've seen this clue in the Evening Standard.

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