Some closures, ultimately, in consequence (6)
I believe the answer is:
result
'consequence' is the definition.
('result' can be a synonym of 'consequence')
'some closures ultimately in' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'RESULT' can be found hidden inside 'closures ultimately in'.
(Other definitions for result that I've seen before include "Consequence in Ulster (6)" , "Verdict" , "Ulster (anag) - outcome" , "Consequence or effect" , "Effect - outcome" .)