Vehicle to leave its haul (5)
I believe the answer is:
cargo
'haul' is the definition.
(thesaurus)
'vehicle to leave' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'to leave' becomes 'go' (to go is to depart or leave).
'car'+'go'='CARGO'
'its' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for cargo that I've seen before include "Stuff on board" , "What gets carried" , "Goods carried by ship, aircraft" , "Freight on board ship" , "Goods in transit" .)