Dismiss; bag (4)
I believe the answer is:
sack
This clue is a double definition.
'dismiss' is the first definition.
(I know that dismiss can be written as sack)
'bag' is the second definition.
(both can mean a container)
(Other definitions for sack that I've seen before include "Plunder; wine; bag" , "Plunder - dry white wine - dismissal" , "Fire; hessian bag" , "Elbow" , "Dismiss; an old wine" .)