Arrange by type (4)
I believe the answer is:
sort
I believe this clue is a double definition.
'arrange' is the first definition.
(I know that arrange can be written as sort)
'type' is the second definition.
(both can mean a kind or variety)
'by' is the link.
(Other definitions for sort that I've seen before include "Arrange systematically" , "'Variety, type (4)'" , "Arrange in order" , "choice of characters frequently used in statistics" , "Arrange; category" .)