Cooked huss with one fish dish (5)
I believe the answer is:
sushi
'fish dish' is the definition.
(I've seen this before)
'cooked huss with one' is the wordplay.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'with' means one lot of letters go next to another.
'one' becomes 'I' (Roman numeral).
'huss' anagrammed gives 'sush'.
'sush'+'i'='SUSHI'
(Other definitions for sushi that I've seen before include "Rice and raw fish wrapped in seaweed" , "fare from Japan" , "Raw fish dishes" , "oriental dish" , "Japanese rice and raw fish dish" .)