Appropriate police station form (4)
I believe the answer is:
nick
I believe this is a triple definition!
'appropriate' is the first definition.
(both can be verbs meaning 'steal' or 'take')
'police station' is the second definition.
(slang term)
'form' is the third definition.
(good nick is good form or condition)
(Other definitions for nick that I've seen before include "go off with > form" , "Prison - cut" , "Little fellow" , "Arrest - steal" , "Notch; steal" .)