Mixed roast Des cooked (8)
I believe the answer is:
assorted
'mixed' is the definition.
(I know this)
'roast des cooked' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'roast'+'des'='roastdes'
'roastdes' anagrammed gives 'ASSORTED'.
(Other definitions for assorted that I've seen before include "Of different kinds put together, like sweets" , "Odd-shaped" , "Containing various different kinds" , "Classified" , "Of various types put together" .)