Newscaster: can one run broadcast? (9)
I believe the answer is:
announcer
'newscaster' is the definition.
(I've seen this before)
'can one run broadcast?' is the wordplay.
'broadcast?' indicates an anagram (I've seen 'broadcast' mean this).
'can'+'one'+'run'='canonerun'
'canonerun' with letters rearranged gives 'ANNOUNCER'.
(Other definitions for announcer that I've seen before include "TV personality" , "presenter" , "Radio station employee" , "TV figure" , "broadcaster" .)