The city makes a change from part of Orpington (5)
I believe the answer is:
ripon
'the city' is the definition.
(I've seen this before)
'a change from part of orpington' is the wordplay.
'a change' becomes 'rip' (rip is a kind of change).
'from' means one lot of letters go next to another.
'part of orpington' becomes 'on' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rip'+'on'='RIPON'
'makes' is the link.
Can you help me to learn more?
(Other definitions for ripon that I've seen before include "see" , "Yorkshire city with cathedral and racecourse" , "N. Yorks city" , "Yorks cathedral" , "Town in N. Yorkshire" .)