Dark rain cloud (6)
I believe the answer is:
nimbus
(Other definitions for nimbus that I've seen before include "Type of rain cloud" , "A black rain cloud" , "Is numb (anag)" , "Storm cloud" , "Ouse/Trent estuary" .)
I believe the answer is:
nimbus
(Other definitions for nimbus that I've seen before include "Type of rain cloud" , "A black rain cloud" , "Is numb (anag)" , "Storm cloud" , "Ouse/Trent estuary" .)