Sort or kind (4)
I believe the answer is:
type
This clue is a double definition.
'sort' is the first definition.
(type is a kind of sort)
'kind' is the second definition.
(type is a kind of kind)
(Other definitions for type that I've seen before include "Category, sort" , "key" , "Sort, variety" , "Use keys" , "Print - classification" .)