The most common and most likely answer to this crossword clue is the 6 letter word STYLET
S
T
Y
L
E
T
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 = stylet.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 STYLET mean?
STYLET noun- An engraving tool, a stylus.
- A style of a plant's flower.
- A slender medical probe or device.
- A poniard or stiletto.
- A stiff, slender organ of an animal.