Prophet in South Africa fried pastry (6)
I believe the answer is:
samosa
'fried pastry' is the definition.
(type of pastry)
'prophet in south africa' is the wordplay.
'prophet' becomes 'Amos' (biblical prophet).
'in' is an insertion indicator.
'south africa' becomes 'sa' (abbreviation).
'amos' inserted inside 'sa' is 'SAMOSA'.
(Other definitions for samosa that I've seen before include "exotic snack" , "Savoury turnover" , "food item" , "Grub from India" , "Triangular fried pastry" .)