The most common and most likely answer to this crossword clue is the 9 letter word KSHATRIYA
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More clues leading to the result KSHATRIYA
Buddy explains!

The straight part
We know that "task for him is to fight" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case task for him is to fight = kshatriya.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 KSHATRIYA mean?
KSHATRIYA noun- The second-highest of the four castes or varnas in traditional Hindu society: the warrior or military caste.
- A member of this caste.