Distant meteor breaks up (6)
I believe the answer is:
remote
'distant' is the definition.
(similar in meaning)
'meteor breaks up' is the wordplay.
'breaks up' indicates an anagram.
'meteor' anagrammed gives 'REMOTE'.
(Other definitions for remote that I've seen before include "Far away in place; slight" , "Miles away" , "Far away as meteor (6)" , "Distant, far away" , "Far-flung" .)