The most common and most likely answer to this crossword clue is the 9 letter word RABBINATE
I've seen this crossword clue in The Guardian
R
A
B
B
I
N
A
T
E
More clues leading to the result RABBINATE
Buddy explains!

The straight part
We know that "religious job" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case religious job = rabbinate.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 RABBINATE mean?
RABBINATE noun- The office or function of a rabbi
- Rabbis collectively