Greet; frozen rain (4)
I believe the answer is:
hail
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">greet</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that greet is a is a more specific form of the action of hail)</span><br/ ><br/ >'<span class="explanation-format__original">frozen rain</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for hail that I've seen before include "Greet - precipitation" , "Precipitation - old greeting" , "a drop of the hard stuff?" , "volley" , "An old Roman salute as to Caesar" .)