Names, including island locations (6)
I believe the answer is:
cities
'names including island locations' is the definition.
I can't judge whether this defines the answer.
'names including island locations' is the wordplay.
'names' becomes 'cites' ('cite' can be a synonym of 'name').
'including' means one lot of letters goes inside another.
'island locations' becomes 'i' (I can't justify this - if you can you should give a lot more credence to this answer).
'cites' placed around 'i' is 'CITIES'.
Can you help me to learn more?
(Other definitions for cities that I've seen before include "Large Urban areas" , "Densely populated urban areas" , "Densely-populated urban areas" , "Large conurbations" , "Dickens novel, 'A Tale of Two ......'" .)