The most common and most likely answer to this crossword clue is the 9 letter word GENTLEMAN
I've seen this crossword clue in Financial Times
G
E
N
T
L
E
M
A
N
More clues leading to the result GENTLEMAN
- Two honourable guys employing singular valet
- Glen met an awfully decent chap
- Elegant, refined male accepted by nobility at the outset
- Fellow has information about mental breakdown
- Name oddly associated with elegant refined chap
- To start with, Napoleon enters to receive the French soldier — a well mannered person
- Elegant name regularly used for refined fellow
Buddy explains!

The straight part
We know that "Fellow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fellow = gentleman.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 GENTLEMAN mean?
GENTLEMAN noun- A man of gentle but not noble birth, particularly a man of means (originally ownership of property) who does not work for a living but has no official status in a peerage; an armiferous man ranking below a knight.
- Any well-bred, well-mannered, or charming man.
- An effeminate or oversophisticated man.
- (polite term of address) Any man.
- (usually historical, sometimes derogatory) An amateur or dabbler in any field, particularly those of independent means.
- An amateur player, particularly one whose wealth permits him to forego payment.