The most common and most likely answer to this crossword clue is the 3 plus 7 letter word JOB SHARING
I've seen this crossword clue in The Times
J
O
B
S
H
A
R
I
N
G
Buddy explains!
The straight part
We know that "an example of joint endeavour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case an example of joint endeavour = job sharing.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 JOB SHARING mean?
JOB SHARING noun- An arrangement whereby multiple people are employed on a part-time basis to perform a job normally available to one working full-time, and remuneration is apportioned between them.