Upset ever wiser critics (9)

I believe the answer is:

reviewers

'critics' is the definition.
(reviewer is a kind of critic)

'upset ever wiser' is the wordplay.
'upset' indicates an anagram.
'ever'+'wiser'='everwiser'
'everwiser' is an anagram of 'REVIEWERS'.

(Another definition for reviewers that I've seen is " critics".)

I've seen this clue in The Telegraph.

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