Sack accountant heirs corrupted (7)
I believe the answer is:
cashier
'sack' is the definition.
(I've seen this before)
'accountant heirs corrupted' is the wordplay.
'accountant' becomes 'ca' (abbreviation for chartered accountant**).
'corrupted' is an anagram indicator.
'heirs' with letters rearranged gives 'shier'.
'ca'+'shier'='CASHIER'
(Other definitions for cashier that I've seen before include "Discharge" , "Shop payment taker" , "Remove from service" , "Bank clerk" , "Bank teller" .)