Sudden strong wind or storm (6)
I believe the answer is:
squall
This clue is a double definition.
'sudden strong wind' is the first definition.
(I've seen this before)
'storm' is the second definition.
(I've seen this before)
(Other definitions for squall that I've seen before include "Sudden storm of wind and rain, or a baby's cry" , "Short violent gust of wind and rain" , "Short-lived violent gust of wind and rain" , "Sudden strong wind" , "Brief violent storm" .)