Load vehicle before journey (5)
I believe the answer is:
cargo
'load' is the definition.
(I know that load can be written as cargo)
'vehicle before journey' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'before' means one lot of letters go next to another.
'journey' becomes 'go' (I've seen this in other clues).
'car'+'go'='CARGO'
(Other definitions for cargo that I've seen before include "Shipment" , "stuff to be carried by ship" , "This taken on board" , "Goods carried by a large vehicle" , "Freight on board ship" .)