Censors wrong about good assembly (8)
I believe the answer is:
congress
'assembly' is the definition.
(Congress is an example)
'censors wrong about good' is the wordplay.
'wrong' indicates anagramming the letters.
'about' indicates putting letters inside.
'good' becomes 'g' (abbreviation).
'censors' with letters rearranged gives 'conress'.
'conress' placed around 'g' is 'CONGRESS'.
(Other definitions for congress that I've seen before include "old-style commerce" , "Politicians" , "Meeting of delegates" , "US legislative body" , "USA parliament" .)