The most common and most likely answer to this crossword clue is the 12 letter word PEACEKEEPING
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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 PEACEKEEPING mean?
PEACEKEEPING noun- The act of preserving peace, specifically between hostile groups or states, especially by a sanctioned military force.
- (as a noun modifier) (for example) a peacekeeping force.