Second prophet with a snack (6)
I believe the answer is:
samosa
'snack' is the definition.
(I've seen this before)
'second prophet with a' is the wordplay.
'second' becomes 's' (common abbreviation).
'prophet' becomes 'amos' (biblical prophet).
'with' means one lot of letters go next to another.
's'+'amos'+'a'='SAMOSA'
(Other definitions for samosa that I've seen before include "A bit of food" , "food item" , "Savoury turnover" , "Indian dish" , "Asian food" .)