Ran round in the commotion caused by the storm (7)
I believe the answer is:
tornado
'the storm' is the definition.
(type of weather)
'ran round in the commotion' is the wordplay.
'round' indicates an anagram.
'in the' indicates putting letters inside.
'commotion' becomes 'todo' (synonyms).
'ran' is an anagram of 'rna'.
'rna' going within 'todo' is 'TORNADO'.
'caused by' is the link.
(Other definitions for tornado that I've seen before include "A violent and destructive whirlwind" , "lot of wind" , "Tempest'" , "Hurricane" , "This is quite a blow" .)