Cold, the capital briefly windy (9)
I believe the answer is:
apathetic
'cold' is the definition.
(thesaurus)
'the capital briefly windy' is the wordplay.
'briefly' means to remove the last letter.
'windy' indicates an anagram (windy suggests disruption).
'the'+'capital'='thecapital'
'thecapital' with its last letter taken off is 'thecapita'.
'thecapita' with letters rearranged gives 'APATHETIC'.
(Other definitions for apathetic that I've seen before include "Impassive" , "Lacking passion" , "showing no enthusiasm" , "past caring?" , "Indifferent - without emotion" .)