Arrange to be 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)
'be kind' is the second definition.
(I've seen this in another clue)
'to' acts as a link.
(Other definitions for sort that I've seen before include "Tidy" , "Work out" , "class" , "Separate - kind" , "Group" .)