Crossword Genius

Space traveller (9)

Ross

I think it could be either:

astronaut

cosmonaut

'space traveller' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for astronaut that I've seen before include "Buzz Aldrin, e.g." , "spaceman" , "heavenly voyager" , "Space voyager" , "For member of high-flying mission" .)

I've seen this clue in The Independent, The Irish Times, The Times, the Sydney Morning Herald and The Sun.
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