Get better vehicle (4-2)
I believe the answer is:
pick-up
I believe this is a double definition.
'get better' is the first definition.
(picking up is a kind of getting better)
'vehicle' is the second definition.
(I've seen this before)
(Other definitions for pick-up that I've seen before include "Small van" , "Small low-sided truck" , "Light open lorry with low sides and a tailboard" , "Recover" , "Collect; casually acquire" .)