Avenue or boulevard, eg (6)
I believe the answer is:
street
I believe this is a double definition.
'avenue' is the first definition.
(I've seen this in another clue)
'boulevard eg' is the second definition.
(I know that avenue is a type of street)
(Other definitions for street that I've seen before include "Built-up road" , "Somerset town; urban way" , "Part of motorist's route" , "City road" , "Form of theatre" .)