The most common and most likely answer to this crossword clue is the 8 letter word TELETHON
I've seen this crossword clue in The Guardian
T
E
L
E
T
H
O
N
More clues leading to the result TELETHON
- Short message recalled about hospital fundraiser
- Oddly, they spilt the beans about hospital fund-raiser
- Figure seizing hotel involved in fund-raiser
- Sent back short letter about hospital’s fund-raising programme
- Terry manages the live charity event
- Elton rocks, hosting the broadcast TV event
- Short letter returned about hospital fundraiser
- Broadcast fundraiser from hotel, somehow breaking number of green bottles
- Catch up around dodgy hotel giving long performance
- 10 supporting new hotel event for charity
Buddy explains!

The straight part
We know that "fund-raiser" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fund-raiser = telethon.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TELETHON mean?
TELETHON noun- A televised fundraising event encouraging viewers to make donations via telephone.