Note the broadcast about large fundraiser (8)
I believe the answer is:
telethon
'fundraiser' is the definition.
(I've seen this in another clue)
'note the broadcast about large' is the wordplay.
'broadcast' indicates anagramming the letters (letters scattered or cast around).
'about' indicates putting letters inside.
'large' becomes 'L' (eg in clothes sizes).
'note'+'the'='notethe'
'notethe' anagrammed gives 'teethon'.
'teethon' placed around 'l' is 'TELETHON'.
(Other definitions for telethon that I've seen before include "TV broadcast for charity" , "Television event to raise funds for charity" , "Lengthy TV programme for charity" , "Long charity TV show" , "Lengthy broadcast for charity" .)