Spattered red wine covering complete quilt (9)
I believe the answer is:
eiderdown
'quilt' is the definition.
(eiderdown is a kind of quilt)
'spattered red wine covering complete' is the wordplay.
I cannot quite see how this works, but
an anagram of 'red' is 'der' which is located in the answer.
'complete' could be 'do' (doing is a kind of completing) and 'do' is present in the answer.
an anagram of 'wine' is 'eiwn' which is located in the remaining letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for eiderdown that I've seen before include "Feather quilt" , "Soft quilt filled with duck feathers" , "Find cover" , "What might keep one warm" , "Warm bedcover" .)