Arousing state monarch (6)
I believe the answer is:
waking
'arousing state monarch' is the definition.
I can't tell whether this definition defines the answer.
'arousing state monarch' is the wordplay.
'arousing state' becomes 'wa' (I am not sure about this - if you are sure you should believe this answer much more).
'monarch' becomes 'king' (king is a kind of monarch).
'wa'+'king'='WAKING'
Can you help me to learn more?
(Other definitions for waking that I've seen before include "Stirring, coming to life" , "prelude to rising" , "getting aroused" , "Emerging from sleep" , "conscious hours" .)