The most common and most likely answer to this crossword clue is the 10 letter word COAUTHORED
I've seen this crossword clue in Financial Times
C
O
A
U
T
H
O
R
E
D
Buddy explains!
The straight part
We know that "wrote joint work" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wrote joint work = coauthored.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 COAUTHORED mean?
COAUTHORED verb- To write something in collaboration with another author.