Journalist travelled back across city centre (6)
I believe the answer is:
editor
'journalist' is the definition.
(thesaurus)
'travelled back across city centre' is the wordplay.
'travelled' becomes 'rode' (I've seen this in other clues).
'back' is a reversal indicator.
'across' indicates putting letters inside.
'city centre' becomes 'it' (centre of the word 'city').
'rode' in reverse letter order is 'edor'.
'edor' going around 'it' is 'EDITOR'.
(Other definitions for editor that I've seen before include "Senior journalist" , "Do tire out the newspaper head" , "Times boss maybe" , "Newspaper boss" , "Journalist - rioted (anag)" .)