Orbiting body (9)
I believe the answer is:
satellite
'orbiting body' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for satellite that I've seen before include "Part of telecoms system" , "Any celestial body orbiting around a planet or star" , "Body moving around a planet" , "Lackey" , "Heavenly body revolving around a planet" .)