Possible Clues:

• Its cycle is indicated by the starts of 20-, 32-, 40- and 55-Across
• Bare the bottom
• Callisto or Caliban
• Phobos or Deimos
• Remove boxers, maybe, from sumo-only section
• Satellite whose day is almost 30 Earth days
• Put the bottom up?
• In romance poetry, a frequent rhyme for June
• Unexpected rear view?
• Twelve guys walked on it