Fellow broadcasters with new entertainer (8)
I believe the answer is:
comedian
'entertainer' is the definition.
(I know that comedian is a type of actor)
'fellow broadcasters with new' is the wordplay.
'fellow' becomes 'co' (eg a co-worker is a fellow worker).
'broadcasters' becomes 'media' (TV and radio broadcasters are part of the media).
'with' says to put letters next to each other.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'co'+'media'+'n'='COMEDIAN'
(Other definitions for comedian that I've seen before include "Comic" , "Stand-up" , "Humorous entertainer" , "cracking bloke?" , "Any Python for instance" .)