Outrageous for one of the monarchs to claim Ohio (9)
I believe the answer is:
egregious
'outrageous' is the definition.
(I've seen this before)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for egregious that I've seen before include "Notably bad" , "Extraordinary" , "Outstandingly villainous" , "Outstandingly bad" , "Insufferable" .)