Member of royal house reforming rascal at inn (11)

I believe the answer is:

lancastrian

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'member of royal house' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'reforming rascal at inn' is the wordplay.
'reforming' indicates anagramming the letters.
'rascal'+'at'+'inn'='rascalatinn'
'rascalatinn' anagrammed gives '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.

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