The most common and most likely answer to this crossword clue is the 5 letter word HARDY
I've seen this crossword clue in The Sunday Telegraph
H
A
R
D
Y
More clues leading to the result HARDY
- Sturdy author
- Only just missing line for writer, d. ’28
- Writer finds way into literary festival
- Difficult years making one tough
- Writer Grass takes drive up
- Robust and tough – McIlroy, ultimately
- Only just failing to secure the Labour leadership
- Brave Thomas?
- Difficult year for English novelist
- Writer of annuals, sort of
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 = hardy.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 HARDY mean?
HARDY noun- (usually in the plural) Anything, especially a plant, that is hardy.
- A blacksmith's fuller or chisel, having a square shank for insertion into a square hole in an anvil, called the hardy hole.
- Having rugged physical strength; inured to fatigue or hardships.
- Able to survive adverse growing conditions.
- Brave and resolute.
- Impudent.