The most common and most likely answer to this crossword clue is the 10 letter word LIVELIHOOD
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Buddy explains!

The straight part
We know that "Occupation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case occupation = livelihood.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 LIVELIHOOD mean?
LIVELIHOOD noun- A means of providing the necessities of life for oneself (for example, a job or income).
- Property which brings in an income; an estate.
- Liveliness; appearance of life.
- The course of someone's life; a person's lifetime, or their manner of living; conduct, behaviour.