Astronaut (8)
'astronaut' is the definition.
(I know that astronaut can be written as spaceman)
This is the entire clue.
(Other definitions for spaceman that I've seen before include "Distant traveller" , "one requiring a supply of oxygen?" , "Out-of-this-world chap?" , "Armstrong, say" , "High flier" .)
'astronaut' is the definition.
(I know that cosmonaut is a type of astronaut)
This is all the clue.
(Other definitions for cosmonaut that I've seen before include "Long distance traveller" , "Russian space traveller" , "Spaceman" , "Yuri Gagarin, for example" .)