Programme's boss travelled north to secure that certain something (6)
I believe the answer is:
editor
'programme's boss travelled north to secure that certain something' is the definition.
'editor' can be an answer for 'programme's' (editor is a kind of programme). I am not certain of the rest of the definition.
'travelled north to secure that certain something' is the wordplay.
'travelled' becomes 'rode' (eg travelled on a horse).
'north' says the letters should be written in reverse (in a down clue, letters go up or 'north').
'to secure' indicates putting letters inside (inserted letters are secured inside).
'that certain something' becomes 'it' (eg a pop star may be said to have 'it').
'rode' backwards is 'edor'.
'edor' placed around 'it' is 'EDITOR'.
Can you help me to learn more?
(Other definitions for editor that I've seen before include "One prepares a work for publication" , "Redactor" , "Person who determines the final content of a text" , "Director of newspaper" , "Person in charge of a publication" .)