Possible Clues:

• Quondam Welsh rite re-enacted
• Where list is meddled with once
• Where list has been modified, formerly
• Previously lost Whistler's Tate's fourth
• Former language that�s gathered with translated Latin
• Former — list where (anag)
• Former holiday period with time travelling west, captured in edited reels
• One-time hits were played around back of hall
• Dancing reels with ex
• One-time or previous