South African right to eat fish (7)
I believe the answer is:
sardine
'fish' is the definition.
(I know that sardine is a type of fish)
'south african right to eat' is the wordplay.
'south african' becomes 'SA' (abbreviation).
'right' becomes 'r' (common abbreviation).
'to eat' becomes 'dine' (to dine is to eat a meal).
'sa'+'r'+'dine'='SARDINE'
(Other definitions for sardine that I've seen before include "Small fish, usually canned" , "Small pilchard" , "Fish (often tinned)" , "(Cramped?) fish" , "Stonefish OR? Stone" .)