Bound by editor, it ends broadcast (8)
I believe the answer is:
destined
'bound' is the definition.
(synonyms)
'by editor it ends broadcast' is the wordplay.
'by' means one lot of letters go next to another.
'editor' becomes 'ed'.
'broadcast' indicates anagramming the letters.
'it'+'ends'='itends'
'itends' anagrammed gives 'destin'.
'ed' put after 'destin' is 'DESTINED'.
(Other definitions for destined that I've seen before include "Intended (for a particular end)" , "Designated" , "Didn't see, being fated" , "Intended; doomed" , "Fated, fore-ordained" .)