Delicious food in Oman, naturally (5)
I believe the answer is:
manna
'delicious food' is the definition.
(I've seen this before)
'in oman naturally' is the wordplay.
'in' indicates the answer is hidden within the clue.
'MANNA' is hidden within 'oman naturally'.
(Other definitions for manna that I've seen before include "Miraculous stuff dropped" , "Food God gave to Moses" , "Sweet gum; an unexpected benefit" , "Divine food" , "unexpected windfall" .)