Crossword Genius

I name Rex mistakenly as analyst (8)

Ross

I believe the answer is:

examiner

'analyst' is the definition.
(thesaurus)

'i name rex mistakenly' is the wordplay.
'mistakenly' indicates an anagram.
'i'+'name'+'rex'='inamerex'
'inamerex' is an anagram of 'EXAMINER'.

'as' acts as a link.

(Other definitions for examiner that I've seen before include "Who judges" , "One in charge of test" , "One looks for information" , "Tester or inspector" , "Assessor" .)

I've seen this clue in The Times.
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