Power shower audible? (5)
I believe the answer is:
reign
'power' is the definition.
(thesaurus)
'shower audible?' is the wordplay.
'shower' becomes 'rain' (synonyms).
'audible?' shows a homophone (sound like) (I've seen 'audible' mean this).
'rain' is a homophone of 'REIGN'.
(Other definitions for reign that I've seen before include "Rule of monarch" , "Monarch's period" , "Control" , "Rule - dominate" , "Dominion" .)