Related Clues:

• Memorandum
• Whatever's left
• Memory jogger
• ... and part of its cure
• A security
• Do, re or mi
• Semiquaver, e.g.
• Remain idle
• Do on a scale
• Musical notation
• Conserve energy
• A,B,C or D
• Record, in a way
• It's left (with "the")
• Symbol at the head of a musical staff