Stops vehicle, arrest seen shortly (3)
I believe the answer is:
bus
'stops vehicle' is the definition.
(vehicle which stops at bus stops)
'arrest seen shortly' is the wordplay.
'arrest' becomes 'bust' (bust can mean a police arrest).
'seen shortly' means to remove the last letter (the word is shortened).
'bust' with its final letter taken away is 'BUS'.
(Other definitions for bus that I've seen before include "Road vehicle able to carry many passengers" , "Mode of public transport" , "Public service vehicle" , "Use transport" , "Large passenger vehicle - small business!" .)