Press broadcast lie about politician (5)
I believe the answer is:
impel
'press' is the definition.
(thesaurus)
'broadcast lie about politician' is the wordplay.
'broadcast' is an anagram indicator.
'about' means one lot of letters goes inside another.
'politician' becomes 'mp'.
'lie' is an anagram of 'iel'.
'iel' placed around 'mp' is 'IMPEL'.
(Other definitions for impel that I've seen before include "Press on - drive forward" , "Force into motion" , "Make" , "Send or drive forward" , "Urge forward - push" .)