City was on way up after conflict (6)
I believe the answer is:
warsaw
'city' is the definition.
(Warsaw is an example)
'was on way up after conflict' is the wordplay.
'on way up' says the letters should be written in reverse.
'after' means one lot of letters go next to another.
'conflict' becomes 'war' (war is a kind of conflict).
'was' in reverse letter order is 'saw'.
'saw' put after 'war' is 'WARSAW'.
(Other definitions for warsaw that I've seen before include "1929 international agreement regulating commercial air transport" , "Polands capital" , "European city (with a Convention for commercial flying)" , "Polish capital" , "Capital city of Poland" .)