Urban eyesore
I believe the answer is:
slum
'urban eyesore' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for slum that I've seen before include "Area of bad housing" , "Run-down area of city with tenements" , "Squalid neighbourhood" , "Squalid and overcrowded urban area" , "Over-crowded run-down city area" .)