See, in plaza, endless filth (7)

I believe the answer is:

squalor

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'filth' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for squalor that I've seen before include "Dirt and untidiness" , "Sleaziness, mean poverty" , "Extremely dirty state" , "Dirty conditions" , "State of misery and filth" .)

I've seen this clue in The Sunday Times and The Times.

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