Drove off to the port (5)
I believe the answer is:
dover
'the port' is the definition.
(English port)
'drove off' is the wordplay.
'off' indicates an anagram.
'drove' is an anagram of 'DOVER'.
'to' is the link.
(Other definitions for dover that I've seen before include "White cliffs port" , "Roved around the English port" , "Channel port" , "There'll be blue clouds over the white cliffs here" , "Kentish port" .)