A censor changed about one script (8)
I believe the answer is:
scenario
'script' is the definition.
(scenario is a kind of script)
'a censor changed about one' is the wordplay.
'changed' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'a'+'censor'='acensor'
'acensor' with letters rearranged gives 'scenaro'.
'scenaro' enclosing 'i' is 'SCENARIO'.
(Other definitions for scenario that I've seen before include "Outline of film, novel, etc" , "plotting for a film" , "Envisaged situation" , "Dramatic set-up" , "Film/novel plot outline" .)