News peak negotiator (8)
I believe the answer is:
mediator
'negotiator' is the definition.
(mediator is a kind of negotiator)
'news peak' is the wordplay.
'news' becomes 'media' (I've seen this in another clue).
'peak' becomes 'tor' (a tor is a rocky peak).
'media'+'tor'='MEDIATOR'
(Other definitions for mediator that I've seen before include "Negotiator between opposing parties" , "An honest broker" , "One seeking to reconcile opponents" , "Person working to settle disputes" , "Go-between, negotiator" .)