Bombard with snowballs (4)
I believe the answer is:
pelt
'bombard with snowballs' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pelt that I've seen before include "Skin - throw things at" , "what rain might do" , "Skin of a fur-bearing mammal" , "Raw hide" , "Shower with missiles - hide" .)