Broadcaster seen on eastern island (4)
I believe the answer is:
skye
'island' is the definition.
(Scottish island)
'broadcaster seen on eastern' is the wordplay.
'broadcaster' becomes 'sky' (Sky is a broadcast TV channel).
'seen on' is a charade indicator (letters next to each other).
'eastern' becomes 'e'.
'sky'+'e'='SKYE'
(Other definitions for skye that I've seen before include "Island in a boat song about Flora MacDonald and Bonnie Prince Charlie" , "somewhere off Scotland's west coast" , "Largest island of Scotland's Inner Hebrides" , "Destination of a princely boat trip" , "Scotland island" .)