Shower heralds ultimately clean feet, with area scrubbed (5)
I believe the answer is:
nimbi
'shower heralds' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nimbi that I've seen before include "rings" , "They may surround the head" , "Rain clouds - halos" , "Rain-clouds" , "Dark things" .)