Planetary orbiter, one that flies by central belt of Uranus (5)
I believe the answer is:
titan
'planetary orbiter one that flies' is the definition.
I can't tell whether this definition defines the answer.
'by central belt of uranus' is the wordplay.
'by' means one lot of letters go next to another.
'central' indicates the central letters.
'belt' becomes 'band' (belt can mean a band of material).
'of uranus' becomes 'tit' (I am not sure about this - if you are sure you should believe this answer much more).
The middle letters of 'band' are 'an'.
'an' put after 'tit' is 'TITAN'.
Can you help me to learn more?
(Other definitions for titan that I've seen before include "Taint in a great man" , "Giant -- rocket" , "An old Greek god - Atlas was one" , "Giant of Greek mythology" , "Taint in a mythical giant" .)