Passes on major road having elevated sections (7)
I believe the answer is:
imparts
'passes on' is the definition.
('impart' can be a synonym of 'pass on')
'major road having elevated sections' is the wordplay.
'major road' becomes 'MI' (resembles M1, English motorway).
'having elevated' is a reversal indicator (in a down clue, letters go up).
'sections' becomes 'parts' ('part' can be a synonym of 'section').
'mi' backwards is 'im'.
'im'+'parts'='IMPARTS'
(Other definitions for imparts that I've seen before include "grants" , "Communicates" , "Passes on knowledge" , "Transmits, knowledge perhaps" , "Gives information about armpits" .)