The most common and most likely answer to this crossword clue is the 8 letter word SADDLERY
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More clues leading to the result SADDLERY
Buddy explains!

The straight part
We know that "job with horses" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case job with horses = saddlery.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 SADDLERY mean?
SADDLERY noun- The trade or craft of a saddler.
- A place of business of a saddler.
- The inventory and equipment of a saddler; saddles and other horse-riding equipment, or the materials for making them.