An old poem funnily satirised (9)
I believe the answer is:
lampooned
'satirised' is the definition.
('lampoon' can be a synonym of 'satirize')
'an old poem funnily' is the wordplay.
'funnily' indicates anagramming the letters.
'an'+'old'+'poem'='anoldpoem'
'anoldpoem' is an anagram of 'LAMPOONED'.
(Other definitions for lampooned that I've seen before include "made to look silly" , "Publicly ridiculed" , "Satirised" .)