Miscellaneous when classified (8)
I believe the answer is:
assorted
'miscellaneous' is the definition.
(synonyms)
'when classified' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'classified' becomes 'sorted' ('sort' can be a synonym of 'classify').
'as'+'sorted'='ASSORTED'
(Other definitions for assorted that I've seen before include "Manifold" , "Odd-shaped" , "Motley" , "Mixed" , "Of various types put together" .)