Related Clues:

• Unruffled
• Attends as a visitor, with 'on'
• Subs
• Substitutes
• Substitutes (for)
• Blankets
• Joins a jam session
• Bedding
• Hides from view
• Lids
• Performs as a guest
• Rerecords
• Takes part as a visitor
• Bedclothes
• Audits, perhaps