Media campaign (5)
I believe the answer is:
press
This clue is a double definition.
'media' is the first definition.
(the press is part of the media)
'campaign' is the second definition.
(I've seen this before)
(Other definitions for press that I've seen before include "Newspapers - bring weight to bear" , "Put creases in" , "that may gather when news is expected" , "Newspaper industry" , "newspapermen?" .)