Vehicle veered across the embankment (5)
I believe the answer is:
levee
'embankment' is the definition.
(I've seen this before)
'vehicle veered across' is the wordplay.
'across' indicates the answer is hidden within the clue.
'LEVEE' is hidden in the letters of 'vehicle veered'.
'the' is the link.
(Other definitions for levee that I've seen before include "Embankment on the Mississippi" , "Flood embankment" , "Riverside embankment" , "Gathering" , "River bank reinforcement, particularly in the US" .)