Not a hub: a poor motorway (8)
I believe the answer is:
autobahn
'motorway' is the definition.
(I know that autobahn is a type of motorway)
'not a hub a poor' is the wordplay.
'poor' indicates anagramming the letters.
'not'+'a'+'hub'+'a'='notahuba'
'notahuba' anagrammed gives 'AUTOBAHN'.
(Other definitions for autobahn that I've seen before include "high-speed route" , "It takes continental drivers" , "Great way" , "Motorway in Germany" , "overseas route" .)