One in Mali with it organised fighters (7)
I believe the answer is:
militia
'one in mali with it organised fighters' is the definition.
I can't judge whether this definition defines the answer.
'one in mali with it organised' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' means one lot of letters goes inside another.
'with' is a charade indicator (letters next to each other).
'organised' indicates anagramming the letters.
'mali' after 'it' is 'itmali'.
'itmali' anagrammed gives 'mlitia'.
'i' inserted inside 'mlitia' is 'MILITIA'.
Can you help me to learn more?
(Other definitions for militia that I've seen before include "Armed civilians" , "Fighting force of civilians" , "Body of civilian soldiers" , "Force raised for emergency" , "Reserve force" .)