Cook double corn - it's fabulous food (6,4)
I believe the answer is:
cordon bleu
'fabulous food' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'cook double corn' is the wordplay.
'cook' indicates anagramming the letters.
'double'+'corn'='doublecorn'
'doublecorn' anagrammed gives 'CORDON BLEU'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for cordon bleu that I've seen before include "Old bouncer (anag)" , "Highest class (cooking)" , "Of a very high standard (food)" , "High-class cookery" , "(Of cookery) very high standard" .)