Say they won't reintegrate (6)
I believe the answer is:
refuse
'say' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for refuse that I've seen before include "Decline to accept - waste" , "Turn down, reject" , "Decline to take the rubbish" , "Decline to jump; rubbish" , "litter" .)