Pipes (5)

I believe the answer is:

tubes

'pipes' is the definition.
(I know this)

This is all the clue.

(Other definitions for tubes that I've seen before include "Hoses, pipes, lines etc" , "Long hollow conduits" , "Piping" , "Hollow cylindrical shapes" , "Long hollow cylinders" .)

I've seen this clue in the Sydney Morning Herald, the New York Times and The Times.

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