Where Londoners may be teased about a bit of fun (4,3)
I believe the answer is:
east end
'where londoners' is the definition.
The definition suggests a singular noun which matches the answer.
'may be teased about a bit of fun' is the wordplay.
'may be' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'a bit of fun' becomes 'n' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'teased' anagrammed gives 'easted'.
'easted' going around 'n' is 'EAST END'.
Can you help me to learn more?
(Other definitions for east end that I've seen before include "London Cockney area" , "Tower Hamlets area" , "Part of London first to see rising sun" , "ockney London" , "where plates are for standing on?" .)