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 anagramming the letters.
'drove' anagrammed gives 'DOVER'.
'to' acts as a 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" .)