Broadcaster's policy for Horizon (7)
I believe the answer is:
skyline
'horizon' is the definition.
(I know that horizon can be written as skyline)
'broadcaster's policy' is the wordplay.
'broadcaster' becomes 'sky' (Sky is a television company).
'policy' becomes 'line' (I've seen this in another clue).
'sky'+'line'='SKYLINE'
'for' is the link.
(Other definitions for skyline that I've seen before include "City horizon" , "Visible horizon" , "Silhouette or outline of buildings" , "Horizon; like NY's (anag.)" , "Outline of hills or buildings against firmament" .)