Journalist travelled up to collect computers etc (6)
I believe the answer is:
editor
'journalist' is the definition.
(senior journalist)
'travelled up to collect computers etc' is the wordplay.
'travelled' becomes 'rode' (I've seen this before).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'to collect' means one lot of letters goes inside another (inserted letters are collected by others).
'computers etc' becomes 'IT' (short for Information Technology).
'rode' in reverse letter order is 'edor'.
'edor' enclosing 'it' is 'EDITOR'.
(Other definitions for editor that I've seen before include "Source of leaders" , "One who revises another's writing" , "cutter?" , "Person who revises and prepares for publication" , "Press boss" .)