Dream about restraining one drunk fighting civilians (7)
I believe the answer is:
militia
'fighting civilians' is the definition.
(I've seen this before)
'dream about restraining one drunk' is the wordplay.
'dream about' becomes 'mia' (I can't justify this - if you can you should give a lot more credence to this answer).
'restraining' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'drunk' becomes 'lit' (I've seen this in another clue).
'i'+'lit'='ilit'
'mia' enclosing 'ilit' is 'MILITIA'.
Can you help me to learn more?
(Other definitions for militia that I've seen before include "Body of civilian soldiers" , "Force raised for emergency" , "Civilian army force" , "Armed civilians" , "Military force of trained civilians" .)