Unconnected (8)
'unconnected' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for separate that I've seen before include "Not joined or touching" , "Move" , "Individual and distinct" , "Divide, keep apart" , "Not joined or united with others" .)
(Other definitions for lone that I've seen before include "He likes to operate by himself" , "Single and isolated" , "Companionless" , "The ... Ranger, fictional masked cowboy" , "Solitary, without companions" .)