Plunder; large bag (4)
I believe the answer is:
sack
I believe this is a double definition.
'plunder' is the first definition.
(I know that plunder can be written as sack)
'large bag' is the second definition.
(I've seen this before)
(Other definitions for sack that I've seen before include "Fire - rifle" , "Dismiss; an old wine" , "destroy > 50s dress" , "Elbow" , "See 12" .)