Eider and red fez in the wash together but preserved (6-5)
I believe the answer is:
freeze-dried
'preserved' is the definition.
(I've seen this before)
'eider and red fez in the wash together' is the wordplay.
I cannot really understand how this works, but
an anagram of 'eider' is 'edrie' which is within the answer.
'red' could be 'r' (I've seen this in other clues) and 'r' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'but' is the link.
Can you help me to learn more?
(Another definition for freeze-dried that I've seen is " Preserved food".)