Editorials making readers switch sides at first (7)
I believe the answer is:
leaders
'editorials making readers switch' is the definition.
I can't judge whether this defines the answer.
'sides at first' is the wordplay.
'sides' becomes 'ers' (I am not sure about this - if you are sure you should believe this answer much more).
'at' means one lot of letters go next to another (I've seen this in other clues).
'first' becomes 'lead' (lead can mean leading or primary).
'ers' after 'lead' is 'LEADERS'.
Can you help me to learn more?
(Other definitions for leaders that I've seen before include "newspaper articles" , "They take the initiative and direct others" , "People to follow" , "Top people" , "Bosses" .)