Conclusion sometimes drawn by an organist (4)
I believe the answer is:
stop
'conclusion' is the definition.
(stop is a kind of conclusion)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for stop that I've seen before include "Arrest" , "Intercept" , "Refrain from" , "Cease; organ voice" , "port of call" .)