Deal with; classify (4,3)
I believe the answer is:
sort out
This clue is a double definition.
'deal with' is the first definition.
(to sort out is to take care of or deal with)
'classify' is the second definition.
(I know that classify can be written as sort out)
(Other definitions for sort out that I've seen before include "Arrange" , "Resolve - to put in order" , "Group" , "Resolve (a problem)" , "handle" .)