Reviewer is mostly pain in the neck, it is claimed (6)

I believe the answer is:

critic

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'reviewer' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for critic that I've seen before include "Professional analyst of works of art" , "One writing reviews" , "A reviewer of plays, books etc" , "Commentator, pundit" , "Newspaper reviewer" .)

I've seen this clue in The Independent.

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