Left notes for unaccompanied types (6)
I believe the answer is:
loners
'types' is the definition.
(I have seen 'Unsociable types ' mean 'loners' so perhaps 'types' could also mean 'loners')
'left notes for unaccompanied' is the wordplay.
'left notes' becomes 'rs' (I am not sure about this - if you are sure you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'unaccompanied' becomes 'lone' (on one's own).
'rs' after 'lone' is 'LONERS'.
Can you help me to learn more?
(Other definitions for loners that I've seen before include "Unsociable folk" , "Unsociable types" , "They prefer not to associate with others" , "People who prefer their own company" , "They avoid company" .)