Song won't upset slum district (10)
I believe the answer is:
shantytown
'slum district' is the definition.
'shantytown' can be an answer for 'district' (shantytown is a kind of district). I'm unsure of the 'slum' bit.
'song won't upset' is the wordplay.
'song' becomes 'shanty' (shanty is a kind of song).
'upset' indicates anagramming the letters.
'wont' anagrammed gives 'town'.
'shanty'+'town'='SHANTYTOWN'
Can you help me to learn more?
(Other definitions for shantytown that I've seen before include "Deprived area of very poor housing" , "Deprived urban area of run-down huts" , "area of ramshackle housing" , "Area with ramshackle buildings" , "Collection of poor dwellings" .)