Reigning cats and dogs back in pluvial part of Australia (10)
I believe the answer is:
queensland
'part of australia' is the definition.
(state of Australia)
'reigning cats and dogs back in pluvial' is the wordplay.
'reigning cats' becomes 'queens' (female cats. I am not sure about the 'reigning' bit.).
'dogs' is a charade indicator (letters next to each other) (dogs can mean follows or chases).
'back in' says to take the final letters (the 'back' of the word).
The last letter of 'pluvial' is 'l'.
'and' after 'l' is 'land'.
'queens'+'land'='QUEENSLAND'
Can you help me to learn more?
(Other definitions for queensland that I've seen before include "Australian state" , "part of Australia" , "NE state of Australia" , "Australian territory" .)