Take commission away from the bank employee (7)

I believe the answer is:

cashier

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'bank employee' is the definition.
(someone working in a bank)

I don't understand the rest of the clue.

(Other definitions for cashier that I've seen before include "Bank employee" , "Bank worker - dismiss from the armed forces" , "banking officer" , "Dismiss; receiver and payer of money" , "One working till" .)

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

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