Boris perhaps turns attention to John in Edinburgh? (7)
I believe the answer is:
etonian
'boris perhaps' is the definition.
(Boris Johnson attended Eton College)
'turns attention to john in edinburgh?' is the wordplay.
'turns' shows that the letters should be reversed in order.
'attention' becomes 'note' (I've seen this before).
'to john in edinburgh?' becomes 'ian' (I've seen this in another clue).
'note' back-to-front is 'eton'.
'eton'+'ian'='ETONIAN'
(Other definitions for etonian that I've seen before include "Relating to one particular school" , "Public schoolboy" , "Pupil at posh English school" , "Public school kid" , "Alumnus of famous English school" .)