Crowd beside pub working for media mogul (5,5)
I believe the answer is:
press baron
'media mogul' is the definition.
(I've seen this before)
'crowd beside pub working' is the wordplay.
'crowd' becomes 'press' (to press can mean to crowd around).
'beside' is a charade indicator (letters next to each other).
'pub' becomes 'bar' (both are drinking establishments).
'working' becomes 'on' (on can mean working or activated).
'press'+'bar'+'on'='PRESS BARON'
'for' is the link.
(Other definitions for press baron that I've seen before include "media mogul" , "Important newspaperman" , "Beaverbrook?" .)