Titled fellow from circle in London borough (7)
I believe the answer is:
baronet
'titled fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'circle in london borough' is the wordplay.
'circle' becomes 'O' (O is a circle).
'in' means one lot of letters goes inside another.
'london borough' becomes 'Barnet' (Barnet is a borough of London).
'o' placed into 'barnet' is 'BARONET'.
'from' is the link.
Can you help me to learn more?
(Other definitions for baronet that I've seen before include "Titled man" , "Aristocrat" , "Lowest hereditary title of honour" , "Member of the British order of honour" , "Hereditary knight" .)