Look back at advantage concerning English dish (8)
I believe the answer is:
kedgeree
'dish' is the definition.
(I know that Kedgeree is a type of dish)
'look back at advantage concerning english' is the wordplay.
'look back' becomes 'k' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'at' is a charade indicator (letters next to each other).
'advantage' becomes 'edge' (having the edge is having an advantage).
'concerning' becomes 're' (both can mean on a particular topic).
'english' becomes 'e' (abbreviation).
'k'+'edge'+'re'+'e'='KEDGEREE'
Can you help me to learn more?
(Other definitions for kedgeree that I've seen before include "Fish/rice/egg dish" , "Rice, fish and egg dish" , "Dish of rice, smoked fish and eggs" , "Dish of rice, hard-boiled eggs and cooked flaked fish" , "Fishy breakfast dish" .)