Part of London one learns about (7)
I believe the answer is:
arsenal
'part of london' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'one learns about' is the wordplay.
'one' becomes 'a'.
'about' indicates an anagram.
'learns' is an anagram of 'rsenal'.
'a'+'rsenal'='ARSENAL'
Can you help me to learn more?
(Other definitions for arsenal that I've seen before include "First FA Cup winners" , "Premier League side founded by munitions workers in 1886" , "A military store of guns and armaments" , "English football club and military depot" , "Football club and military store" .)