Conclude, stop (6)
I believe the answer is:
finish
I believe this is a double definition.
'conclude' is the first definition.
(I've seen this before)
'stop' is the second definition.
(synonyms)
(Other definitions for finish that I've seen before include "Put the final touches to" , "Culminate" , "End or terminus" , "Conclude, wind up" , "Patina" .)