The most common and most likely answer to this crossword clue is the 9 letter word BOOKMAKER
I've seen this crossword clue in The Guardian
B
O
O
K
M
A
K
E
R
More clues leading to the result BOOKMAKER
Buddy explains!
The straight part
We know that "Might one interest better/author" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case might one interest better/author = bookmaker.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 BOOKMAKER mean?
BOOKMAKER noun- A person who prints or binds books.
- A person who compiles books from the writings of others.
- A person (or a business) who calculates odds and accepts bets, especially on horse racing; a bookie.