Provision for retirement party, fancy red wine being passed round (9)
I believe the answer is:
eiderdown
'provision for retirement' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'party fancy red wine being passed round' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'fancy' indicates an anagram.
'being passed round' means one lot of letters goes inside another.
'red'+'wine'='redwine'
'redwine' with letters rearranged gives 'eiderwn'.
'do' put into 'eiderwn' is 'EIDERDOWN'.
Can you help me to learn more?
(Other definitions for eiderdown that I've seen before include "what ducks have to offer us" , "cover when retired" , "I wondered about this warm bed covering" , "What might keep one warm" , "Feather quilt" .)