A rare mist resulting from wind (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
airstream
'wind' is the definition.
(airstream is a kind of wind)
'a rare mist resulting from' is the wordplay.
'resulting from' is an anagram indicator.
'rare'+'mist'='raremist'
'raremist' with letters rearranged gives 'irstream'.
'a'+'irstream'='AIRSTREAM'
(Other definitions for airstream that I've seen before include "What might waft" , "Atmospheric flow" , "wash" , "Atmospheric current" , "Jet" .)