Cab takes German round motorway (6)
I believe the answer is:
hansom
'cab' is the definition.
(I've seen this before)
'german round motorway' is the wordplay.
'german' becomes 'hans' (I've seen this before).
'round' becomes 'o' (round can mean a round object).
'motorway' becomes 'm'.
'hans'+'o'+'m'='HANSOM'
'takes' acts as a link.
(Other definitions for hansom that I've seen before include "transport from the old days" , "Two-wheeled horse-drawn covered carriage" , "Old horse cab sounds attractive" , "Victorian cab" , "Type of cab" .)