Conclude, wind up (6)
I believe the answer is:
finish
I believe this clue is a double definition.
'conclude' is the first definition.
(I've seen this before)
'wind up' is the second definition.
(synonyms)
(Other definitions for finish that I've seen before include "perfection" , "Conclude, stop" , "End, conclusion" , "'End, close (6)'" , "surface texture" .)