Related Clues:

• Additional ones not itemized
• Move to first class, e.g.
• Sound of music
• One on a musical scale
• Stop arguing
• Brief missive
• Musical production
• Reason for a stop
• Whatever's still there
• Unused portion
• Stand still
• See 51 Across
• Freedom from activity
• There's none for the weary
• Kind of period or home