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Pipe problem (4)

Ross

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4

7

'pipe problem' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for rust that I've seen before include "Reddish coating formed on iron through 11 across" , "deteriorate" , "A fungus; a corrosion" , "Reddish-brown coating formed on metal by moisture" , "Reddish-brown coating formed on metal by damp" .)

I've seen this clue in the LA Times, the King Feature Syndicate, the Penny Press and the Newsday.
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