European capital willing to consider form of change externally (10)
I believe the answer is:
copenhagen
'european capital' is the definition.
(capital of Denmark)
'willing to consider form of change externally' is the wordplay.
'willing to consider' becomes 'open' (I can't explain this - if you can you should give a lot more credence to this answer).
'form of' indicates an anagram (the letters need to be in another 'form').
'externally' indicates putting letters inside (some letters go on the outside of others).
'change' anagrammed gives 'chagen'.
'open' placed into 'chagen' is 'COPENHAGEN'.
Can you help me to learn more?
(Other definitions for copenhagen that I've seen before include "below Wellington" , "Danish capital" , "Duke of 21's horse at Waterloo -- capital city" , "Capital - battle won by 15" , "European capital" .)