Silly inflammatory stuff, admitting I'm turning Conservative (7)
I believe the answer is:
comical
'silly' is the definition.
(thesaurus)
'inflammatory stuff admitting i'm turning conservative' is the wordplay.
'inflammatory stuff' becomes 'coal' (coal is burned).
'admitting' means one lot of letters goes inside another (admit can mean to welcome in or accept).
'turning' says the letters should be written in reverse.
'conservative' becomes 'C' (UK political abbreviation).
'im' backwards is 'mi'.
'mi'+'c'='mic'
'coal' placed around 'mic' is 'COMICAL'.
(Other definitions for comical that I've seen before include "Rich" , "priceless" , "Humorous" , "Witty" , "Causing laughter" .)