Possible cause of an icy glare (5)

I believe the answer is:

sleet

(Other definitions for sleet that I've seen before include "Partially frozen rain" , "Snowy rain" , "Partly melted falling 16 across or 18 down" , "Mixed rain and melting snow" , "Mixture of rain and snow" .)

I've seen this clue in The New York Times.

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