Plunder; money (4)
I believe the answer is:
loot
This clue is a double definition.
'plunder' is the first definition.
(I know that plunder can be written as loot)
'money' is the second definition.
(I know that loot is a type of money)
(Other definitions for loot that I've seen before include "Booty; sack" , "Tool found among plunder" , "Prize" , "Steal goods as spoils" , "Stolen goods" .)