Crossword Genius

Tube stop (4)

Ross

I believe the answer is:

stem

I believe this is a double definition.

'tube' is the first definition.
(stem is a kind of tube)

'stop' is the second definition.
(stemming is a kind of stopping)

(Other definitions for stem that I've seen before include "Halt flow" , "Slender upright part, of flower or glass" , "part of vegetable?" , "Slender upright part, of flower or wineglass" , "something growing?" .)

I've seen this clue in The Telegraph.
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