Observe that judge has left target for tabloid? (5)

I believe the answer is:

celeb

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'tabloid?' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

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

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(Other definitions for celeb that I've seen before include "Famous person (abbr)" , ""Personality"" , "Prominent figure" , "Household name" , "Famous person (sl.)" .)

I've seen this clue in The Times.

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