The most common and most likely answer to this crossword clue is the 9 letter word STEVENSON
I've seen this crossword clue in The Times
S
T
E
V
E
N
S
O
N
More clues leading to the result STEVENSON
- Scottish writer holding vespers briefly on street
- He wrote in earnest, even so, needlessly
- Way English archdeacon’s supported by Scottish writer
- Writer of Rocket Man, did you say?
- Old Scottish author making sense on TV
- Holy man quits working for author
- His doctor transformed the way service finishes early
- From southern town, originally, and yet northern writer
- Writer of Rocket Man, we hear
- Author‘s position over red meat I twice ignored
Buddy explains!

The straight part
We know that "Writer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case writer = stevenson.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.