Titan orbits it (6)
I believe the answer is:
saturn
'titan orbits it' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for saturn that I've seen before include "deity" , "tried to pass vessel" , "Planet with concentric rings" , "Roman god - planet" , "Runs at (anag) - Roman god" .)