Simon had some olives in a bar (7)

I believe the answer is:

bolivar

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'simon' is the definition.
(I've seen this before)

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

(Other definitions for bolivar that I've seen before include "Founder of Bolivia" , "Foreign brass" , "Basic unit of money in Venezuela" , "Leader of several independence movements by Spain's South American colonies, d. 1830" , "Currency of Venezuela" .)

I've seen this clue in the Evening Standard.

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