Bedcover that is returned could be red and blue (9)
I believe the answer is:
eiderdown
'bedcover' is the definition.
(thesaurus)
'that is returned could be red and blue' is the wordplay.
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'returned' says the letters should be written in reverse.
'could be' indicates anagramming the letters.
'and' means one lot of letters go next to another.
'blue' becomes 'down' (I've seen this before).
'ie' back-to-front is 'ei'.
'red' is an anagram of 'der'.
'ei'+'der'+'down'='EIDERDOWN'
(Other definitions for eiderdown that I've seen before include "What might keep one warm" , "thermal insulation" , "I wondered about this warm bed covering" , "what may be on tonight" , "Soft quilt filled with duck feathers" .)