System for better transport (4)
I believe the answer is:
tote
I believe this clue is a double definition.
'system for better' is the first definition.
(betting terminology, so a system for a bett-er)
'transport' is the second definition.
(toting is a kind of transporting)
(Other definitions for tote that I've seen before include "Large bag" , "transport" , "record of stakeholders' investments" , "Haul, carry" , "Wield or carry something heavy" .)