Wind alert: yes, windy! (8)
I believe the answer is:
easterly
'wind' is the definition.
(I know that easterly is a type of wind)
'alert yes windy' is the wordplay.
'windy' indicates an anagram (windy suggests disruption).
'alert'+'yes'='alertyes'
'alertyes' with letters rearranged gives 'EASTERLY'.
(Other definitions for easterly that I've seen before include "The sort of wind that brings cold air to this country" , "Year's let (anag) - direction of 15" , "Wind coming from Britain, say" , "Invariably cold wind" , "large blow" .)