The most common and most likely answer to this crossword clue is the 9 letter word AUTOGRAPH
I've seen this crossword clue in Financial Times
A
U
T
O
G
R
A
P
H
More clues leading to the result AUTOGRAPH
- One's handle in one's hand?
- Car diagram shows what fan may require
- Car chart that’s personally signed
- Sign that a group’s forgotten tango dancing
- Car, one appearing in King George pub sign
- Tough para’s unusual signature
- Put one’s name to plot to support car
- Subscription needed by such a hunter?
- Handle in one’s hand?
- Signature dish of ragout served by a pub
Buddy explains!

The straight part
We know that "what fan may require" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what fan may require = autograph.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 AUTOGRAPH mean?
AUTOGRAPH noun- A person’s own handwriting, especially the signature of a famous or admired person.
- A manuscript in the author’s handwriting.
- To sign, or write one’s name or signature on a book etc
- To write something in one's own handwriting
- Written in the author’s own handwriting.
- Made by the artist himself or herself; authentic.