The approach one takes to a meeting place (6)
I believe the answer is:
'the approach' is the definition.
(both can refer to a road)
'one takes to a meeting place' is the wordplay.
'one' becomes 'a'.
'takes' means one lot of letters go next to another.
'to a meeting place' becomes 'venue' (I've seen this before).
(Other definitions for avenue that I've seen before include "Broad road or street, often with trees" , "Tee-lined road" , "Way of approach" , "Entrance passage" , "Wide (tree-lined) street" .)