Carol eating cold and out-of-date bread (9)
I believe the answer is:
schilling
'out-of-date bread' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'carol eating cold' is the wordplay.
'carol' becomes 'sing' (I've seen this before).
'eating' is an insertion indicator.
'cold' becomes 'chill' (chill is a kind of cold).
'sing' going around 'chill' is 'SCHILLING'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for schilling that I've seen before include "Money not around any more!" , "Old Austrian currency" , "Formerly the basic unit of money in Austria" , "Old Viennese piece" .)