The most common and most likely answer to this crossword clue is the 12 letter word DEMILITARISE
I've seen this crossword clue in The Times
D
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Buddy explains!
The straight part
We know that "free from guns" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case free from guns = demilitarise.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 DEMILITARISE mean?
DEMILITARISE verb- To remove troops from an area.
- To prevent troops from entering an area.
- To return an area to civilian control.