Managed to get large bag of plunder (7)
I believe the answer is:
ransack
'plunder' is the definition.
(I know that plunder can be written as ransack)
'managed to get large bag' is the wordplay.
'managed to get' becomes 'ran' (I've seen this in other clues).
'large bag' becomes 'sack' (I've seen this before).
'ran'+'sack'='RANSACK'
'of' is the link.
(Other definitions for ransack that I've seen before include "Loot or search thoroughly" , "Go through a place causing damage and stealing things" , "Examine thoroughly" , "Plunder; search ruthlessly" , "Rummage, rifle" .)