Change plans to capture free city (10)
I believe the answer is:
copenhagen
'city' is the definition.
(Copenhagen is an example)
'change plans to capture free' is the wordplay.
'plans' is an anagram indicator (I've seen 'plan' mean this (plan can mean organise)).
'to capture' is an insertion indicator.
'free' becomes 'open' (similar in meaning).
'change' is an anagram of 'chagen'.
'chagen' going around 'open' is 'COPENHAGEN'.
(Other definitions for copenhagen that I've seen before include "below Wellington" , "European capital" , "Capital - Wellington's warhorse" , "Capital - battle won by 15" , "Duke of 21's horse at Waterloo -- capital city" .)