Agent has even less money (6)

I believe the answer is:

broker

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'agent' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

(Other definitions for broker that I've seen before include "One buys and sells for others" , "Financial dealer" , "See 7" , "One acts as an agent for others in buying and selling" , "He buys and sells for others - say stocks" .)

I've seen this clue in The Mirror.

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