Arrange by kind (4)
I believe the answer is:
sort
This clue is a double definition.
'arrange' is the first definition.
(I know that arrange can be written as sort)
'kind' is the second definition.
(I know that kind can be written as sort)
'by' acts as a link.
(Other definitions for sort that I've seen before include "Kind, type or make" , "Work out" , "Arrange in order" , "Shuffle into desired sequence" , "The kind to categorise" .)