A confused driver completed the journey (7)
I believe the answer is:
arrived
'completed the journey' is the definition.
(I've seen this before)
'a confused driver' is the wordplay.
'confused' indicates an anagram.
'driver' anagrammed gives 'rrived'.
'a'+'rrived'='ARRIVED'
(Other definitions for arrived that I've seen before include "completed the journey" , "Came" , "A driver (anag.)" , "Reached a destination" .)