Celestial object showing remote deviation (6)
I believe the answer is:
meteor
'celestial object' is the definition.
'remote deviation' is the wordplay.
'deviation' is an anagram indicator.
'remote' with letters rearranged gives 'METEOR'.
'showing' is the link.
(Other definitions for meteor that I've seen before include "Shooting star" , "it appears as a streak of light" , "Body falling from space" , "fighter" , "It causes a streak of light in the night sky" .)