Urban drainage system (5)

I believe the answer is:

sewer

(Other definitions for sewer that I've seen before include "Drain - seamstress?" , "One plying needle; drain" , "Plier of needle; drain" , "Pipe for carrying away waste matter" , "Embroiderer; soil pipe" .)

I've seen this clue in the Newsday.com and the Newsday.

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