Hits a brick wall on both sides of Dublin terrace (4)
I believe the answer is:
hill
'terrace' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for hill that I've seen before include "Mount" , "Small mountain" , "Canvasser of opinions" , "Box ---, Emma picnic site (J.Austen)" , "Gradient" .)