I oppose all narrow-mindedness, Trumpism and idiots primarily (4)
I believe the answer is:
anti
'i oppose all narrow-mindedness' is the definition.
I can't judge whether this definition defines the answer.
'trumpism and idiots primarily' is the wordplay.
'trumpism' becomes 'ant' (I can't justify this - if you can you should believe this answer much more).
'and' is a charade indicator (letters next to each other).
'primarily' suggests taking the first letters.
The first letter of 'idiots' is 'i'.
'ant'+'i'='ANTI'
Can you help me to learn more?
(Other definitions for anti that I've seen before include "Hostile" , "(Person who is) not in favour" , "Not in favor of" , "'No' voter" , "One who is against (something)" .)