Arrest bus before time (4)
I believe the answer is:
bust
'arrest' is the definition.
(bust can mean a police arrest)
'bus before time' is the wordplay.
'before' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'bus'+'t'='BUST'
(Other definitions for bust that I've seen before include "Sculpture of head and shoulders" , "economic collapse" , "Sculpture -- ruined" , "Broken - chest" , "Sculpture of head and chest" .)