Clue: Gorges on English seafood, right away, with most of roll and vegetable (7,7)
Answer: CHINESE CABBAGE
Explanation: Definition: vegetable
A charade of CHINES ('gorges' as ravines; I have only come across the word on the Isle of White, with the best known being Shanklin Chine) plus E ('English') plus C[r]AB ('seafood') minus the R ('right away') plus BAGE[l] ('roll') minus the last letter ('most of').