Belgian city’s exotic new part (7)
I believe the answer is:
antwerp
'belgian city's' is the definition.
(I've seen this before)
'exotic new part' is the wordplay.
'exotic' indicates anagramming the letters.
'new'+'part'='newpart'
'newpart' is an anagram of 'ANTWERP'.
(Other definitions for antwerp that I've seen before include "Busy Belgian port" , "North Belgian port" , "Belgian port and province" , "Rent paw out in Belgium" , "War-damaged city" .)