Waste pipe knocked top off jug (4)

I believe the answer is:

ewer

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'jug' is the definition.
(type of vessel)

I can't explain the rest of the clue.

(Other definitions for ewer that I've seen before include "A wide-lipped jug" , "Large water jug" , "Water-jar" , "from which liquid may be poured" , "A type of jug" .)

I've seen this clue in The Daily Express.

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