Belgian city urges change on Belgian capital (6)
I believe the answer is:
bruges
'belgian city' is the definition.
(I've seen this before)
'urges change on belgian capital' is the wordplay.
'change' indicates an anagram.
'on' is a charade indicator (letters next to each other).
'capital' suggests taking the first letters.
The initial letter of 'belgian' is 'b'.
'urges' with letters rearranged gives 'ruges'.
'ruges' put after 'b' is 'BRUGES'.
(Other definitions for bruges that I've seen before include "Belgian place" , "Historic city in Belgium" , "Belgian port" , "Historic Belgian city" .)