...in varying types when fixed (8)
I believe the answer is:
assorted
'fixed' is the definition.
(thesaurus)
'in varying types when' is the wordplay.
I cannot really understand how this works, but
'when' could be 'as' (eg 'when I walked' means 'as I walked') and 'as' is located in the answer.
The remaining letters 'sorted' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for assorted that I've seen before include "Stared so at a varied mixture as of sweets" , "Motley" , "Odd-shaped" , "Divers" , "Rod's seat (anag)" .)