Character something that clashes when outspoken (6)
I believe the answer is:
symbol
'character' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for symbol that I've seen before include "Material object representing something abstract" , "Non-verbal sign that has significance" , "Sign that represents something else" , "Emblem, icon" , "Sign that stands for something" .)