Windstorm (7)
This clue is a double definition.
'wind' is the first definition.
(I've seen this before)
'storm' is the second definition.
(type of weather)
(Other definitions for tornado that I've seen before include "Violent wind vortex" , "Cyclone, twister" , "Donator (anag.)" , "Violent wind storm" , "Violent whirlwind over land" .)
(Other definitions for cyclone that I've seen before include "storm in the West Indies, say" , "Typhoon" , "lots of wind" , "Violent whirling wind" , "Violent windstorm" .)
'windstorm' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for gale that I've seen before include "Strong wind" , "Squall" , "A storm of wind and rain" , "A wild storm" , "Bille from a bladder" .)