A few snowflakes -- blast! (6)
I believe the answer is:
flurry
This clue is a double definition.
'a few snowflakes' is the first definition.
(I've seen this before)
'blast' is the second definition.
(thesaurus)
(Other definitions for flurry that I've seen before include "Light snowfall" , "Sudden rush of wind and rain, or a commotion" , "Active commotion - brief snowfall" , "Bustle" , "squall" .)