Fighters dream about arresting one drunk (7)
I believe the answer is:
militia
'fighters dream' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'about arresting one drunk' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found in the answer.
'one' could be 'li' (I've seen this in other clues) and 'li' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for militia that I've seen before include "Body of citizen soldiers" , "Fighting force raised from the civil population" , "Home Guard" , "levy" , "Citizen soldiery" .)