Dismiss bank employee (7)
I believe the answer is:
cashier
This clue is a double definition.
'dismiss' is the first definition.
(thesaurus)
'bank employee' is the second definition.
(I've seen this before)
(Other definitions for cashier that I've seen before include "One handling money" , "Shop payment taker" , "Dismiss; receiver and payer of money" , "One handles the money" , "till tender?" .)