Parodist’s poem Lorna revised (9)
I believe the answer is:
lampooner
'parodist's' is the definition.
(synonyms)
'poem lorna revised' is the wordplay.
'revised' indicates an anagram.
'poem'+'lorna'='poemlorna'
'poemlorna' anagrammed gives 'LAMPOONER'.
(Other definitions for lampooner that I've seen before include "Paler moon for one who indulges in personal satire" , "Parodist" , "One given to ridicule" , "Satirist" , "One setting off squib" .)