Dismiss a bank official (7)

I believe the answer is:

cashier

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

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

(Other definitions for cashier that I've seen before include "employee accepting money" , "banking officer" , "Teller - dismiss in disgrace" , "person dealing in LSD, say, once?" , "One handles the money" .)

I've seen this clue in The Globe and Mail.

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