Member of royal house reforming rascal at inn (11)

I believe the answer is:

lancastrian

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

'member of royal house' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'reforming rascal at inn' is the wordplay.
'reforming' indicates an anagram.
'rascal'+'at'+'inn'='rascalatinn'
'rascalatinn' is an anagram of 'LANCASTRIAN'.

Can you help me to learn more?

(Other definitions for lancastrian that I've seen before include "Northerner" , "Red rose supporter" , "County type" , "County guy" , "Devotee of the red rose" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.