Adjusted change around available capital (10)
I believe the answer is:
copenhagen
'capital' is the definition.
(Copenhagen is an example)
'adjusted change around available' is the wordplay.
'adjusted' indicates anagramming the letters.
'around' means one lot of letters goes inside another.
'available' becomes 'open' ('open' can be similar in meaning to 'available').
'change' anagrammed gives 'chagen'.
'chagen' placed around 'open' is 'COPENHAGEN'.
(Other definitions for copenhagen that I've seen before include "Capital - Wellington's warhorse" , "Capital - battle won by 15" , "Danish capital" , "European capital" , "Duke of 21's horse at Waterloo -- capital city" .)