Roadway (6)
(Other definitions for avenue that I've seen before include "suburban street" , "Way of approach" , "A wide street or access route" , "Drive" , "Tree-lined approach to a house" .)
'roadway' is the definition.
(I know that street is a type of roadway)
This is the entire clue.
(Other definitions for street that I've seen before include "- Arab; - light" , "City thoroughfare" , "Public road in a conurbation" , "Tester (anag.)" , "City road" .)