Hollow cylinder (4)

I believe the answer is:

tube

'hollow cylinder' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tube that I've seen before include "Pack of toothpaste; type of train" , "Transport system" , "Long, hollow cylinder" , "TV" , "Hollow cylindrical object" .)

I've seen this clue in The Mirror, The Times, the Penny Press and The Sun.

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