Rabble - rain (6)
I believe the answer is:
shower
This clue is a double definition.
'rabble' is the first definition.
(I've seen this before)
'rain' is the second definition.
(shower is a kind of rain)
(Other definitions for shower that I've seen before include "Brief period of rain" , "Short fall of rain" , "Bathroom plumbing fixture" , "Brief fall of rain or hail" , "Person demonstrating" .)