The broadcast is about Conservative morals (6)
I believe the answer is:
ethics
'morals' is the definition.
('ethics' can be a synonym of 'morals')
'the broadcast is about conservative' is the wordplay.
'broadcast' is an anagram indicator.
'about' is an insertion indicator.
'conservative' becomes 'c' (abbreviation commonly used in UK politics).
'the' anagrammed gives 'eth'.
'eth'+'is'='ethis'
'ethis' placed around 'c' is 'ETHICS'.
(Other definitions for ethics that I've seen before include "Codes of standards in business" , "Work of Aristotle" , "rules of conduct" , "Moral principles in middle" , "Professional codes of behaviour.18 Serious or heartfelt" .)