A little snow is mostly dangerous to airmen (5)
I believe the answer is:
flake
'a little snow' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for flake that I've seen before include "Piece of skin or snow" , "Flat thin fragment" , "A little snow" , "Piece of falling snow" , "Small piece of snow" .)