Arrest, apprehend (3)
I believe the answer is:
nab
I believe this clue is a double definition.
'arrest' is the first definition.
(I know that arrest can be written as nab)
'apprehend' is the second definition.
(synonyms)
(Other definitions for nab that I've seen before include "nail" , "Collar (sl.)" , "Catch; grab suddenly" , "Catch (thief) (colloq.)" , "Cop" .)