Icy wet stuff (5)
I believe the answer is:
sleet
'icy wet stuff' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sleet that I've seen before include "Mixed rain and melting snow" , "Partly melted falling snow or hail" , "Partly frozen rain" , "Icy rain" , "Snowy rain" .)