Sack teller (7)
I believe the answer is:
cashier
I believe this is a double definition.
'sack' is the first definition.
(I've seen this before)
'teller' is the second definition.
(synonyms)
(Other definitions for cashier that I've seen before include "Sack" , "banking officer" , "Money handler; dismiss from the forces" , "I search (anag) - dismiss from armed forces with disgrace" , "employee accepting money" .)