Poet verifies, right? Wrong! (9)
I believe the answer is:
versifier
'poet' is the definition.
(I know that versifier is a type of poet)
'verifies right? wrong' is the wordplay.
'right?' becomes 'r' (common abbreviation).
'wrong' indicates an anagram.
'verifies'+'r'='verifiesr'
'verifiesr' anagrammed gives 'VERSIFIER'.
(Other definitions for versifier that I've seen before include "Lay expert" , "One can produce short poem" , "linesman" , "Poet" .)