Insult female cashier (7)
I believe the answer is:
dismiss
'cashier' is the definition.
(I've seen this before)
'insult female' is the wordplay.
'insult' becomes 'dis' (I've seen this in another clue).
'female' becomes 'miss' (miss refers to a young woman).
'dis'+'miss'='DISMISS'
(Other definitions for dismiss that I've seen before include "Sack (from job)" , "Remove from office" , "P45" , "Throw out" , "Fire - cashier" .)