Sack she and I bundled into the car (7)
I believe the answer is:
cashier
'sack' is the definition.
(I've seen this before)
'she and i bundled into the car' is the wordplay.
'and' is a charade indicator (letters next to each other).
'bundled' indicates an anagram (I've seen 'bundle' mean this).
'into' indicates putting letters inside.
'she' put after 'i' is 'ishe'.
'ishe' is an anagram of 'shie'.
'shie' put into 'car' is 'CASHIER'.
(Other definitions for cashier that I've seen before include "money dispenser" , "Teller - dismiss in disgrace" , "Fire" , "Bank worker - dismiss from the armed forces" , "Person dealing with money" .)