Squalid area, where you can't keep your feet? (4,3)

I believe the answer is:

skid row

'squalid area' is the definition.

I don't understand the remainder of the clue.

(Other definitions for skid row that I've seen before include "Run-down part of town (mainly US)" , "Area inhabited by vagrants" , "Run-down part of US town frequented by vagrants" , "insalubrious area of town" , "US slum" .)

I've seen this clue in The Guardian.

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