Close arrest (4)
I believe the answer is:
stop
I believe this clue is a double definition.
'close' is the first definition.
(close can mean to stop or come to an end)
'arrest' is the second definition.
(I know that arrest can be written as stop)
(Other definitions for stop that I've seen before include "Part of organ" , "Come to an end" , "Refrain from" , "as per instruction" , "Don't allow" .)