Related Clues:

• Paths of celestial bodies around others
• Paths of the planets
• Travels in circular path like planet
• Goes around like paths of planets
• Courses, or parts thereof
• Of course they're round
• Where they're going around with the alternative pieces
• The alternative to pieces, as a matter of course
• 9 across has one of them - or pieces of them
• One goes around in them, or perhaps not wholly so
• One gets around them, or parts of them (6)
• Courses or parts thereof
• The roundabouts, or parts thereof
• They get around as a matter of course, with the alternative pieces
• Of course they go around and it's round, so it is