Finally struck margin on European food (8)
I believe the answer is:
kedgeree
'food' is the definition.
(kedgeree is a kind of food)
'finally struck margin on european' is the wordplay.
'finally' suggests the final letters.
'margin' becomes 'edge' (synonyms).
'on' becomes 're' ('on' can be mean 'with reference to').
'european' becomes 'e' (abbreviation e.g. EU).
The last letter of 'struck' is 'k'.
'k'+'edge'+'re'+'e'='KEDGEREE'
(Other definitions for kedgeree that I've seen before include "fishy meal" , "Food" , "Dish of rice, smoked fish and eggs" , "Dish of rice, hard-boiled eggs and cooked flaked fish" , "Indian cookery" .)