Good dinner broadcast is beamed (7)
I believe the answer is:
grinned
'is beamed' is the definition.
(I've seen this in another clue)
'good dinner broadcast' is the wordplay.
'good' becomes 'g' (abbreviation).
'broadcast' is an anagram indicator (letters scattered or cast around).
'dinner' anagrammed gives 'rinned'.
'g'+'rinned'='GRINNED'
(Other definitions for grinned that I've seen before include "Smiled broadly" , "was amused" .)