Island using computers invested in personal one? (7)
I believe the answer is:
britain
'island' is the definition.
(Great Britain)
'computers invested in personal one?' is the wordplay.
'computers' becomes 'IT' (information technology).
'invested in' is an insertion indicator.
'personal one?' becomes 'brain' (I am not sure about this - if you are sure you should believe this answer much more).
'it' placed inside 'brain' is 'BRITAIN'.
'using' is the link.
Can you help me to learn more?
(Other definitions for britain that I've seen before include "Largest UK island" , "Country" , "UK's largest island" , "State" , "Where we live - Great!" .)