Avenue or boulevard, eg (6)
I believe the answer is:
street
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">avenue</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">boulevard eg</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that avenue is a type of street)</span><br/ ><br/ ></span>
(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" .)