Also coming through is a darn whirl wind (7)
I believe the answer is:
tornado
'wind' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for tornado that I've seen before include "Terrible storm" , "Severe wind" , "Whirling storm" , "Destructive wind vortex" , "Hurricane" .)