Water fall (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
rain
'water fall' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rain that I've seen before include "downfall?" , "See 12" , "Come down in showers" , "Weather - shower" , "Storm" .)