Possible Clues:

• It comes down to this; one is not an artist in oils
• Soft fall?
• Artist's representation of a winter shower
• It comes down heavily on having cats and dogs involved
• Not a painter in oils, perhaps
• Thus might the Academician get precipitated into the bathtub
• What a comedown for the artist to be having a bath like this!
• It can make Arran wet, distributed round island
• Cistern's catch
• Drops from a cloud