Team goes in to halt closure (8)
I believe the answer is:
screwtop
'closure' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'team goes in to halt' is the wordplay.
'team' becomes 'crew' (crew is a kind of team).
'goes in' means one lot of letters goes inside another.
'to halt' becomes 'stop' ('stop' can be a synonym of 'halt').
'crew' placed into 'stop' is 'SCREWTOP'.
Can you help me to learn more?
(Other definitions for screwtop that I've seen before include "Describing a type of bottle" , "one goes on the bottle" , "that closes jar" , "kind of bottle" , "cap or lid" .)