Blizzard or typhoon (5)
I believe the answer is:
storm
This clue is a double definition.
'blizzard' is the first definition.
(I've seen this in another clue)
'typhoon' is the second definition.
(thesaurus)
(Other definitions for storm that I've seen before include "Assault (with troops)" , "SECOND PART OF 1 DOWN" , "Very unfavourable climate" , "Squall" , "Rampage" .)