Stop talking and come to a rational deduction (8)
I believe the answer is:
conclude
'stop' is the definition.
(I know that close is a type of cease)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for conclude that I've seen before include "Close, end" , "Infer or bring to an end" , "Infer - close - resolve" , "Decide by reasoning or draw to a close" , "Terminate; deduce" .)