Raised road (8)
I believe the answer is:
causeway
'raised road' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for causeway that I've seen before include "Raised road across low or wet ground" , "Raised road across wet area" , "Raised road or track" , "Raised road across water - may be a Giant's" , "Paved footpath" .)