Extremist talk (5)

I believe the answer is:

utter

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'extremist' is the first definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?

'talk' is the second definition.
(I know that talk can be written as utter)

Can you help me to learn more?

(Other definitions for utter that I've seen before include "Speak, express" , "Say - complete" , "Perfect" , "Complete madman" , "Positive" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.