Refrain from keeping staff closer? (5,3)
I believe the answer is:
screw top
'closer?' is the definition.
(eg something which closes a bottle)
'refrain from keeping staff' is the wordplay.
'refrain from' becomes 'stop' (to refrain from doing something is to stop it).
'keeping' is an insertion indicator.
'staff' becomes 'crew' (crew of workers).
'stop' placed around 'crew' is 'SCREW-TOP'.
(Other definitions for screw top that I've seen before include "lemonade bottle, say" , "closer" , "Round bottle lid" , "One turning to open" , "Stoppered bottle" .)