The most common and most likely answer to this crossword clue is the 6 letter word MANTEL
I've seen this crossword clue in The Guardian
M
A
N
T
E
L
More clues leading to the result MANTEL
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 = mantel.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 MANTEL mean?
MANTEL noun- The shelf above a fireplace which may be also a structural support for the masonry of the chimney.
- A maneuver to surmount a ledge, involving pushing down on the ledge to bring up the body. Also called a mantelshelf.
- To surmount a ledge by pushing down on the ledge to bring up the body.