What does the cryptic crossword clue "Member of royal house reforming rascal at inn (11)" mean?

The wordplay uses an anagram. anagram of RASCAL + AT + INN = LANCASTRIAN The answer is LANCASTRIAN.

Member of royal house reforming rascal at inn (11)

Times Cryptic #29065 | 12 Down | 2024-11-04 flower