Journalist travelled up without it (6)
I believe the answer is:
editor
'journalist' is the definition.
(thesaurus)
'travelled up without it' is the wordplay.
'travelled' becomes 'rode' (I've seen this in other clues).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'rode' in reverse letter order is 'edor'.
'edor' placed around 'it' is 'EDITOR'.
(Other definitions for editor that I've seen before include "Redo it and become head of publication" , "Press boss" , "Source of leaders" , "One expected to make final" , "Person in charge of newspaper" .)