Filled up tape with old broadcast (9)
I believe the answer is:
populated
'filled' is the definition.
'up tape with old broadcast' is the wordplay.
'with' means one lot of letters go next to another.
'broadcast' indicates an anagram.
'up'+'tape'='uptape'
'uptape' put after 'old' is 'olduptape'.
'olduptape' anagrammed gives 'POPULATED'.
(Other definitions for populated that I've seen before include "Inhabited" , "with people" .)