Press and TV nonsense upset referee (8)
I believe the answer is:
mediator
'referee' is the definition.
(thesaurus)
'press and tv nonsense upset' is the wordplay.
'press and tv' becomes 'media' (I've seen this before).
'nonsense' becomes 'rot' (I've seen this before).
'upset' shows that the letters should be reversed in order.
'rot' backwards is 'tor'.
'media'+'tor'='MEDIATOR'
(Other definitions for mediator that I've seen before include "referee" , "peacemaker" , "Go-between, negotiator" , "An honest broker" , "Person working to settle disputes" .)