Staff in bar finding type of bottle (5,3)
I believe the answer is:
screw top
'type of bottle' is the definition.
(I've seen this before)
'staff in bar' is the wordplay.
'staff' becomes 'crew' (crew of workers).
'in' is an insertion indicator.
'bar' becomes 'stop' (bar can mean to stop or prevent).
'crew' inserted into 'stop' is 'SCREW-TOP'.
'finding' is the link.
(Other definitions for screw top that I've seen before include "type of lid" , "closer" , "Type of wine bottle top that causes arguments" , "Common cap or lid" , "Round bottle lid" .)