Warrant-officer Brown's deity (5)
I believe the answer is:
wotan
'deity' is the definition.
(Wotan is an example)
'warrant-officer brown's' is the wordplay.
'warrant officer' becomes 'wo' (this could be a standard abbreviation which I don't know about).
'brown' becomes 'tan' (tan is a kind of brown).
'wo'+'tan'='WOTAN'
Can you help me to learn more?
(Other definitions for wotan that I've seen before include "Germanic god" , "Teutonic god in the Ring Cycle" , "Wagnerian head god" , "Another name for Odin" , "Supreme god" .)