Bearing cost of transport (8)
I believe the answer is:
carriage
This clue could be a double definition.
'bearing cost' is the first definition.
'carriage' can be an answer for 'bearing' (someone's stance or posture). I'm unsure of the 'cost' bit.
'transport' is the second definition.
(being carried or transported)
'of' acts as a link.
Can you help me to learn more?
(Other definitions for carriage that I've seen before include "Coach - bearing" , "Conveyance, its cost" , "Bearing - conveyance" , "Engine- or horse-drawn vehicle" , "Conveyance (of items of merchandise)" .)