Used pastel dishes (6)
I believe the answer is:
plates
'dishes' is the definition.
(I know this)
'used pastel' is the wordplay.
'used' indicates an anagram.
'pastel' with letters rearranged gives 'PLATES'.
(Other definitions for plates that I've seen before include "Staple for food containers" , "dentures" , "Strange staple for crockery items" , "Flat dishes" , "Eating utensils of staple kind" .)