Don't allow to come out (8)
I believe the answer is:
suppress
'come out' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for suppress that I've seen before include "Stifle, feelings or rebellion" , "'Crush, keep down (8)'" , "Crush, put down" , "Prevent from being made public" , "Prevent (from being published)" .)