Stop (a flow) - Crossword Clue, Answer and Explanation

Ross

I believe the answer is:

stem

'stop a flow' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for stem that I've seen before include "part of a ship" , "Flower's stick" , "Ski turn and plant support" , "part of pipe" , "Tube" .)

I've seen this clue in The Times.

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