Blight on the landscape
I believe the answer is:
eyesore
'blight on the landscape' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eyesore that I've seen before include "Ugly prospect" , "Blot on the landscape" , "Hideous sight" , "Something ugly and offensive" , "something one wouldn't want to see" .)