"Slums must be eliminated. [. . .] They are an ____, a corruption.” (David Lloyd George) (7)

I believe the answer is:

eyesore

(Other definitions for eyesore that I've seen before include "Something ugly to look at" , "Ugly item" , "terrible prospect" , "Ugly sight, not nice to see" , "Blemish" .)

I've seen this clue in The Times.

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