Crossword Genius

Potato possibly cut underground (4)


I believe the answer is:


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

'potato possibly cut' is the wordplay.
'potato possibly' becomes 'tuber' (potato is an example of a tuber).
'cut' means to remove the last letter.
'tuber' with its last letter taken off is 'TUBE'.

(Other definitions for tube that I've seen before include "Underground transport", "Valve", "Pipe; underground train", "appearing tinny?", "Pipe (with trains?)".)

I've seen this clue in The Telegraph.
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