It can give rides to a space traveller (8)
I believe the answer is:
asteroid
'a space traveller' is the definition.
(asteroids travel through space)
'it can give rides to' is the wordplay.
'it' becomes 'a' (I can't explain this - if you can you should believe this answer much more).
'can' indicates anagramming the letters (I've seen 'canned' mean this (canned can mean drunk)).
'give' is a charade indicator (letters next to each other).
'rides' put next to 'to' is 'ridesto'.
'ridesto' is an anagram of 'steroid'.
'a'+'steroid'='ASTEROID'
Can you help me to learn more?
(Other definitions for asteroid that I've seen before include "circling rock" , "way-out rock" , "Minor planet" , "Bit of rock that moves around the heavens" , "Rocky body in orbit" .)