Cooked us his nori wrap (5)
I believe the answer is:
sushi
'cooked us his nori wrap' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'cooked us his' is the wordplay.
'cooked' indicates an anagram (letters cooked into a new form).
'us'+'his'='ushis'
'ushis' anagrammed gives 'SUSHI'.
Can you help me to learn more?
(Other definitions for sushi that I've seen before include "Japanese food" , "Japanese rice and raw fish dish" , "fare from Japan" , "Rice, seafood cuisine" , "Japanese cuisine" .)