Crossword Genius

Stalk; staunch (4)

Ross

I believe the answer is:

stem

I believe this is a double definition.

'stalk' is the first definition.
(synonyms)

'staunch' is the second definition.
(synonyms)

(Other definitions for stem that I've seen before include "Main part of noun or verb" , "It supports a plant" , "root" , "supporter of flag, for example" , "Tube" .)

I've seen this clue in The Telegraph and The Times.
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