Crossword Genius

Tyrannical, sinful monarch crushed (9)

Ross

I believe the answer is:

imperious

I'm a little stuck... Click here to teach me more about this clue!

'tyrannical' is the definition.
(thesaurus)

'sinful monarch crushed' is the wordplay.
I cannot really see how this works, but
'monarch' could be 'er' (abbreviation for Elizabeth Regina, British Queen) and 'er' is found in the answer.
The remaining letters 'impious' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for imperious that I've seen before include "Bossy" , "Arrogant, domineering" , "high-handed" , "Haughty - domineering" .)

I've seen this clue in The Hindu.
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