New part ordered in Belgium (7)
I believe the answer is:
antwerp
'in belgium' is the definition.
('Antwerp' is part of 'belgium')
'new part ordered' is the wordplay.
'ordered' indicates anagramming the letters.
'new'+'part'='newpart'
'newpart' is an anagram of 'ANTWERP'.
(Other definitions for antwerp that I've seen before include "harbour" , "Rent paw out in Belgium" , "Wrap net around this Belgian city" , "North Belgian port" , "Belgian city/port" .)