Crossword Genius

Firm raised a lot of money locally, back in trade event (10)

Ross

I believe the answer is:

occurrence

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'event' is the definition.
(occurrence is a kind of event)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for occurrence that I've seen before include "Event" , "Happening" .)

I've seen this clue in The Guardian.
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