A didactic talker (8)

I believe the answer is:

lecturer

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

'talker' is the definition.
(I know that lecturer is a type of talker)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lecturer that I've seen before include "University employee" , "College teacher" , "Education employee" , "University teacher" , "University staff member" .)

I've seen this clue in the Evening Standard.

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.