Censor a headline (6)
I believe the answer is:
banner
I believe this clue is a double definition.
'censor' is the first definition.
(one who bans things)
'a headline' is the second definition.
(I have seen 'large headline' mean 'banner' so perhaps 'headline' could also mean 'banner')
(Other definitions for banner that I've seen before include "A flag - or a censor? (6)." , "Flag bearing a device" , "Tree product; series of games" , "Flag; headline" , "large headline" .)