Control wet weather report (5)
I believe the answer is:
reign
'control' is the definition.
(I know that reign is a type of dominion)
'wet weather report' is the wordplay.
'wet weather' becomes 'rain' (rain is wet weather).
'report' indicates a 'sounds like' (homophone) clue.
'rain' sounds like 'REIGN'.
(Other definitions for reign that I've seen before include "Sovereignty" , "Control" , "are unbeatable!" , "Rule as king or queen" , "period in power" .)