New part, new port (7)
I believe the answer is:
antwerp
'port' is the definition.
(Belgian port)
'new part new' is the wordplay.
'new' is an anagram indicator.
'part'+'new'='partnew'
'partnew' with letters rearranged gives 'ANTWERP'.
(Other definitions for antwerp that I've seen before include "Wrap net around this Belgian city" , "foreign city" , "9/11 [OLYMPIC VENUE]" , "New part of Dutch city" , "harbour" .)