On the road, it's an honour to be in a car (6)
I believe the answer is:
camber
'on the road' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'an honour to be in a car' is the wordplay.
'an honour' becomes 'MBE' (Member of the British Empire award).
'to be in' is an insertion indicator.
'mbe' going within 'car' is 'CAMBER'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for camber that I've seen before include "Convex shape of road surface" , "Upward curve of a road surface" , "Slope on road surface" , "Slight convexity, like the surface of a road" , "bend in road" .)