Possible Clues:

• Io or Phobos
• A satellite's low point
• Word with light or beam
• Idle (around) - satellite
• Appear listless, loving Phoebe
• It may be low on furthest point of horizon
• It may be new or blue
• Place for a halo
• Put the end first?
• There's nothing in a Scot to give light for the knight, by the sound of it