Queen stops reprobate assuming command (9)
I believe the answer is:
imperious
'queen stops reprobate assuming command' is the definition.
I can't tell whether this definition defines the answer.
'queen stops reprobate assuming command' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'stops' is an insertion indicator (stopping can mean blocking a gap).
'reprobate assuming command' becomes 'impious' (I can't explain this - if you can you should give a lot more credence to this answer).
'er' put within 'impious' is 'IMPERIOUS'.
Can you help me to learn more?
(Other definitions for imperious that I've seen before include "Haughty - domineering" , "Bossy" , "Arrogant, domineering" , "high-handed" .)