In America bought vehicle having a particular purpose (3)
I believe the answer is:
cab
'vehicle having a particular purpose' is the definition.
(a cab is a type of vehicle)
'in america bought' is the wordplay.
'in' indicates a hidden word.
'CAB' can be found hidden inside 'america bought'.
(Other definitions for cab that I've seen before include "vehicle" , "info for citizens provided here" , "Hackney" , "Driver's compartment, in lorry say" , "Driving compartment" .)