Storm about in circle (7)
I believe the answer is:
cyclone
'storm' is the definition.
(cyclone is a kind of storm)
'about in circle' is the wordplay.
'about' becomes 'on' (**).
'in' is an insertion indicator.
'circle' becomes 'cycle'.
'on' going inside 'cycle' is 'CYCLONE'.
(Other definitions for cyclone that I've seen before include "Violent storm" , "Depression - tropical storm" , "Spiralling wind" , "kind of weather?" , "Violent windstorm" .)