The rain is gone, having moved from the areas (7)
I believe the answer is:
regions
'areas' is the definition.
('region' can be a synonym of 'area')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for regions that I've seen before include "patches" , "'Areas, locations (7)'" , "Parts of the country" , "Extended areas" , "Ignores (anag.)" .)