Crossword Genius

Underground bar making a comeback, ending in failure (4)


I believe the answer is:


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

'bar making a comeback ending in failure' is the wordplay.
'bar' becomes 'but' (both can mean 'except for').
'making a comeback' shows that the letters should be reversed in order.
'ending in' suggests the final letters.
The final letter of 'failure' is 'e'.
'but' backwards is 'tub'.

(Other definitions for tube that I've seen before include "TV" , "Pipe - railway" , "appearing tinny?" , "Underground transport" , "Valve" .)

I've seen this clue in The Independent.
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