Crossword Genius

Pulse finally brisk in one obsessed with fiscal matters? (6,3)

Ross

I believe the answer is:

monkey nut

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'pulse' is the definition.
(monkey nuts are pulses)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for monkey nut that I've seen before include "goober" , "seed" , "It could be in the bag" , "source of oil" , "Not my nuke (anag.)" .)

I've seen this clue in The Times.
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