Bit of precipitation (8)
I believe the answer is:
raindrop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bit of precipitation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for raindrop that I've seen before include "Water from the heavens" , "Globule of precipitated moisture" , "Little evidence of wet weather" , "Part of a shower" , "Pro-drain (anag)" .)