Crossword Genius

The Underground (4)

Ross

I believe the answer is:

tube

'the underground' is the definition.
(the London Underground is nicknamed the Tube)

This is all the clue.

(Other definitions for tube that I've seen before include "Pipe; underground train" , "Valve" , "TV" , "Hollow body for the underground" , "appearing tinny?" .)

I've seen this clue in The Telegraph.
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