Pull in and stop (6)
I believe the answer is:
arrest
I believe this clue is a double definition.
'pull in' is the first definition.
(arresting is a kind of pulling in)
'stop' is the second definition.
(arrest is a kind of stop)
'and' is the link.
(Other definitions for arrest that I've seen before include "Take into custody as police do" , "Collar" , "Stop - detain" , "Seize and take into custody" , "Cause to stop" .)