Sort to perform secretarial duties? (4)
I believe the answer is:
type
'sort' is the definition.
(type is a kind of sort)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for type that I've seen before include "Sort - pattern - print" , "Class or group of a particular class" , "Kind or class as of people" , "Courier for example" , "Print - classification" .)