River wall (5)
I believe the answer is:
levee
(Other definitions for levee that I've seen before include "Riverside embankment" , "An embankment built to prevent a river from overflowing" , "Quay" , "Flood embankment" , "Artificial embankment" .)
I believe the answer is:
levee
(Other definitions for levee that I've seen before include "Riverside embankment" , "An embankment built to prevent a river from overflowing" , "Quay" , "Flood embankment" , "Artificial embankment" .)