Refined revolutionary plot being broadcast (8)
I believe the answer is:
debonair
'refined' is the definition.
('debonair' can be similar in meaning to 'refined')
'revolutionary plot being broadcast' is the wordplay.
'revolutionary' says the letters should be written in reverse.
'plot' becomes 'bed' (bed is a kind of plot).
'being broadcast' becomes 'onair' (I've seen this before**).
'bed' back-to-front is 'deb'.
'deb'+'onair'='DEBONAIR'
(Other definitions for debonair that I've seen before include "Jaunty, charming" , "Having carefree, suave manner" , "Light-hearted" , "Of good appearance and manners" , "Elegant, jaunty" .)