Russian who is out of this world? (9)
I believe the answer is:
cosmonaut
'russian who is out of this world?' is the definition.
(term for a Russian astronaut)
This is the entire clue.
(Other definitions for cosmonaut that I've seen before include "Yuri Gagarin, for example" , "Long distance traveller" , "Russian space traveller" , "Spaceman" .)