The most common and most likely answer to this crossword clue is the 5 letter word PEACE
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More clues leading to the result PEACE
Buddy explains!

The straight part
We know that "ending to the war" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ending to the war = peace.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 PEACE mean?
PEACE noun- A state of tranquility, quiet, and harmony; absence of violence. For instance, a state free from civil disturbance.
- A state free of oppressive and unpleasant thoughts and emotions.
- Harmony in personal relations.
- A state free of war, in particular war between different countries.
- To make peace; to put at peace; to be at peace.
- To peace out.
- Shut up!, silence!; be quiet, be silent.
- Shortened form of peace out; goodbye.