Interest of GI in true broadcast (8)
I believe the answer is:
intrigue
'interest' is the definition.
(I know that intrigue is a more specific form of the action interest)
'gi in true broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'gi'+'in'+'true'='giintrue'
'giintrue' with letters rearranged gives 'INTRIGUE'.
'of' is the link.
(Other definitions for intrigue that I've seen before include "Secret plotting" , "An underhand plot or conspiracy" , "Mysterious quality" , "Illicit plot" , "Arouse the curiosity of" .)