Put away in vehicle, packed in box: drug smuggled in (12)
I believe the answer is:
incarcerated
'put away' is the definition.
'in vehicle packed in box drug smuggled in' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'packed in box' becomes 'crated'.
'drug' becomes 'e' (e is another name for ecstasy).
'smuggled in' indicates putting letters inside.
'crated' placed around 'e' is 'cerated'.
'in'+'car'+'cerated'='INCARCERATED'
(Other definitions for incarcerated that I've seen before include "Locked up" , "Imprisoned" , "Banged up" .)