TV money-raiser (8)
I believe the answer is:
telethon
'tv money-raiser' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for telethon that I've seen before include "TV broadcast for charity" , "Television event to raise funds for charity" , "TV fundraiser" , "Long charity TV show" , "Lengthy broadcast for charity" .)