Ingredient of Christmas pickle, that's clear (5)
I believe the answer is:
aspic
'clear' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'ingredient of christmas pickle that's' is the wordplay.
'ingredient of' indicates a hidden word.
'ASPIC' is hidden in the letters of 'christmas pickle that'.
Can you help me to learn more?
(Other definitions for aspic that I've seen before include "Jelly made with fish or meat stock" , "stock production" , "Lavender" , "Savoury meat or fish jelly" , "Savoury jelly for meat or vegetable" .)