Light opera's intro one had satirised (9)
I believe the answer is:
lampooned
'satirised' is the definition.
('lampoon' can be a synonym of 'satirize')
'light opera's intro one had' is the wordplay.
'light' becomes 'lamp' (lamp is a kind of light).
'intro' suggests taking the first letters.
'had' becomes 'd' (in contractions e.g. 'I'd', 'you'd' etc).
The first letter of 'operas' is 'o'.
'lamp'+'o'+'one'+'d'='LAMPOONED'
(Other definitions for lampooned that I've seen before include "Publicly ridiculed" , "Satirised" , "made to look silly" .)