She protects one in automobile, from bank clerk (7)
I believe the answer is:
cashier
'bank clerk' is the definition.
(synonyms)
'she protects one in automobile' is the wordplay.
'protects' means one lot of letters goes inside another.
'one' becomes 'I' (Roman numeral).
'in' is an insertion indicator.
'automobile' becomes 'car' (synonyms).
'she' placed around 'i' is 'shie'.
'shie' going inside 'car' is 'CASHIER'.
'from' acts as a link.
(Other definitions for cashier that I've seen before include "One working till" , "employee accepting money" , "Person dealing with money" , "Dismiss (someone) from the armed forces in disgrace" , "Bank teller" .)