Mixed, when arranged (8)
I believe the answer is:
assorted
I believe this clue is a double definition.
'mixed' is the first definition.
(I know that mixed can be written as assorted)
'arranged' is the second definition.
(thesaurus)
'when' is the link.
(Other definitions for assorted that I've seen before include "Various, diverse" , "Odd-shaped" , "Mixed" , "Divers" , "Motley" .)