Space traveller's damaged radio set (8)
I believe the answer is:
asteroid
'space traveller's' is the definition.
(asteroids travel through space)
'damaged radio set' is the wordplay.
'damaged' is an anagram indicator.
'radio'+'set'='radioset'
'radioset' anagrammed gives 'ASTEROID'.
(Other definitions for asteroid that I've seen before include "could be dangerous for astronauts" , "looking like a star?" , "Piece of rock that moves around the heavens" , "Bits of rock that move around the heavens" , "Small rock orbiting the sun" .)