Business van (5)
I believe the answer is:
truck
I believe this is a double definition.
'business' is the first definition.
(dealings, as in 'having no truck with' something)
'van' is the second definition.
(thesaurus)
(Other definitions for truck that I've seen before include "Large road vehicle" , "Bargain" , "Vehicle (with which one has no dealings?)" , "Goods vehicle" , "trade" .)