One thousand beside border about to get English dish (8)
I believe the answer is:
kedgeree
'dish' is the definition.
(kedgeree is a kind of dish)
'one thousand beside border about to get english' is the wordplay.
'one thousand' becomes 'K' (synonyms).
'beside' means one lot of letters go next to another.
'border' becomes 'edge' (synonyms).
'about to get' becomes 're' (I've seen this in other clues).
'english' becomes 'e' (abbreviation).
'k'+'edge'+'re'+'e'='KEDGEREE'
(Other definitions for kedgeree that I've seen before include "Rice, fish and egg dish" , "something to eat" , "Indian cookery" , "Fishy breakfast dish" , "Curried rice, hard-boiled eggs and flaked fish" .)