The most common and most likely answer to this crossword clue is the 12 letter word PARAMILITARY
I've seen this crossword clue in The Daily Telegraph
P
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More clues leading to the result PARAMILITARY
Buddy explains!

The straight part
We know that "Like fighting citizens" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like fighting citizens = paramilitary.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 PARAMILITARY mean?
PARAMILITARY noun- A group of civilians trained and organized in a military fashion, but which do not represent the formal forces of a sovereign power.
- A member of a paramilitary group.
- Relating to a paramilitary