Waterside London thoroughfare (6)
I believe the answer is:
strand
This could be a double definition.
'waterside' is the first definition.
(thesaurus)
'london thoroughfare' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for strand that I've seen before include "Leave high and dry" , "that may be found by the sea" , "Bit of wire, say" , "Single piece of hair, rope etc" , "A thread or a beach" .)