Kind of owl or egret (5)
I believe the answer is:
I believe this clue is a double definition.
'kind of owl' is the first definition.
(I've seen this in another clue)
'egret' is the second definition.
(snowy egret is a kind of egret)
(Other definitions for snowy that I've seen before include "Tintin's dog - describing winter weather" , "Wintry" , "Like cold weather" , "- Mountains; - owl" , "Covered in flakes" .)