Slum area (6)
I believe the answer is:
ghetto
'slum area' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ghetto that I've seen before include "Run-down area" , "Ethic quarter" , "Place for minority" , "Part of city occupied by minority group, like old Jewish quarter" , "poor part of town" .)