Tree-lined approach, a place to meet (6)
I believe the answer is:
avenue
'tree-lined approach' is the definition.
(avenue can mean a road lined with trees)
'a place to meet' is the wordplay.
'place to meet' becomes 'venue' (I've seen this before).
'a'+'venue'='AVENUE'
(Other definitions for avenue that I've seen before include "Drive" , "A broad thoroughfare as in New York" , "Wide, straight road" , "Wide (tree-lined) street" , "Road leading to a house" .)