A truant so confused traveller (9)
I believe the answer is:
astronaut
'traveller' is the definition.
(astronaut is a kind of traveller)
'a truant so confused' is the wordplay.
'confused' is an anagram indicator.
'truant'+'so'='truantso'
'truantso' is an anagram of 'stronaut'.
'a'+'stronaut'='ASTRONAUT'
(Other definitions for astronaut that I've seen before include "Santa tour for space traveller" , "For member of high-flying mission" , "Skier" , "Space explorer" , "Armstrong or Sharman, say" .)