Acquisitive financiers I discovered amongst brokers, wasting time (7)

I believe the answer is:
raiders
'acquisitive financiers' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for raiders that I've seen before include "Marauding attackers" , "Marauders" , "Attacking force" , "' - - of the Lost Ark'" .)
