The most common and most likely answer to this crossword clue is the 9 letter word PLANETOID
I've seen this crossword clue in The Times
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More clues leading to the result PLANETOID
Buddy explains!
The straight part
We know that "Orbiter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case orbiter = planetoid.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PLANETOID mean?
PLANETOID noun- An asteroid of any size
- An asteroid-like body in an orbit beyond the asteroid belt, such as a centaur or Kuiper belt object
- A larger, planetary, body in orbit around the Sun, such as Vesta or (candidate) dwarf planets such Eris or Sedna
- A dwarf planet