Crossword Genius

Proceed to arrest (4)

Ross

I believe the answer is:

stem

I believe this clue is a double definition.

'proceed' is the first definition.
(thesaurus)

'arrest' is the second definition.
(both can mean to stop)

'to' acts as a link.

(Other definitions for stem that I've seen before include "Main stalk of a plant" , "Upward part of a plant" , "Stop the flow of, check" , "Restrain - staunch - supporter" , "Halt flow" .)

I've seen this clue in the Evening Standard.
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