Menu item needs no Moselle in cooking (5,4)
I believe the answer is:
lemon sole
'menu item' is the definition.
(potential dish on a menu)
'no moselle in cooking' is the wordplay.
'in cooking' indicates anagramming the letters (letters processed or cooked).
'no'+'moselle'='nomoselle'
'nomoselle' anagrammed gives 'LEMON SOLE'.
'needs' acts as a link.
(Other definitions for lemon sole that I've seen before include "fish to eat" , "Lose melon, find kind of plaice" , "Succulent flatfish associated with citrus fruit" , "Common flatfish" , "Tasty plaice of citrus origin?" .)