The most common and most likely answer to this crossword clue is the 9 letter word SUPPORTER
I've seen this crossword clue in The Times
S
U
P
P
O
R
T
E
R
More clues leading to the result SUPPORTER
- Champion drink, beer
- Drink with dark beer fan
- Fan needing to drink beer
- Football fan has to drink dark ale
- Drink after drink — one attempting to lift another?
- Champion to drink stout
- Exceptionally fine wine drunk in a second
- . Drink fortified wine with Queen fan, perhaps
- Advocate a couple of drinks
- Champion consumers of alcohol may do so
Buddy explains!

The straight part
We know that "Fan" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fan = supporter.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 SUPPORTER mean?
SUPPORTER noun- A person who gives support to someone or something.
- Something that supports another thing.