The sort to use a machine to write (4)
I believe the answer is:
type
'write' is the definition.
(I know that type is a type of write)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for type that I've seen before include "Sort, classification" , "Category; use keyboard" , "Sort, variety" , "Print form" , "Class or group of a particular class" .)