Celebrated his broadcast inside, hungry (8)
I believe the answer is:
famished
'hungry' is the definition.
(similar in meaning)
'celebrated his broadcast inside' is the wordplay.
'celebrated' becomes 'famed' (synonyms).
'broadcast' is an anagram indicator (letters scattered or cast around).
'inside' is an insertion indicator.
'his' with letters rearranged gives 'ish'.
'famed' placed around 'ish' is 'FAMISHED'.
(Other definitions for famished that I've seen before include "Is fed ham, being very hungry" , "Extremely hungry" , "Ma fished, being starved" .)