Scotsman, the first person that's regularly driven over (7)
I believe the answer is:
macadam
'regularly driven over' is the definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'scotsman the first person' is the wordplay.
'scotsman' becomes 'mac'.
'the first person' becomes 'adam' (biblical first person created).
'mac'+'adam'='MACADAM'
'that's' is the link.
Can you help me to learn more?
(Other definitions for macadam that I've seen before include "stones on the way" , "Road-surfacing material" , "Material for roads" , "Broken stones" , "(Inventor of) road surface" .)