Brief period of rain (6)
I believe the answer is:
shower
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brief period of rain</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for shower that I've seen before include "awful group of people" , "group derogatorily described" , "Downpour, in April say" , "Sprinkle" , "quick fall" .)