Crossword Genius

Stop at the base (4)

Ross

I believe the answer is:

stem

I believe this is a double definition.

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

'the base' is the second definition.
(thesaurus)

'at' acts as a link.

(Other definitions for stem that I've seen before include "Slender vertical part, glass or plant" , "Tube" , "Halt flow" , "race" , "Thwart; support" .)

I've seen this clue in the Evening Standard.
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