Start to learn about lecturing Man City (6)
I believe the answer is:
london
'city' is the definition.
(London is an example)
'start to learn about lecturing man' is the wordplay.
'start to' suggests taking the first letters.
'about' becomes 'on' (as in a book 'on' a certain topic).
'lecturing man' becomes 'don' (don can mean an academic - especially at Oxbridge).
The initial letter of 'learn' is 'l'.
'l'+'on'+'don'='LONDON'
(Other definitions for london that I've seen before include "Where Boris Johnson might be" , "English capital" , "England's capital city" , "Jack - , US author (White Fang); city" , "- Clay; - pride; - plane" .)