Prize referee? (6)

I believe the answer is:

booker

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'prize referee?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

This is the entire clue.

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(Other definitions for booker that I've seen before include "Literary prize" , "U.K. annual prize for best novel" .)

I've seen this clue in the Evening Standard.

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