Indian delicacy, source of sustenance in Pacific territory (6)

I believe the answer is:
samosa
'indian delicacy' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'source of sustenance in pacific territory' is the wordplay.
'source of' suggests taking the first letters (the start - or source - of the word).
'in' indicates putting letters inside.
'pacific territory' becomes 'samoa' (Samoa is an example. I am not sure about the 'pacific' bit.).
The first letter of 'sustenance' is 's'.
's' inserted inside 'samoa' is 'SAMOSA'.
Can you help me to learn more?
(Other definitions for samosa that I've seen before include "Small Indian turnover, fried and served hot" , "Small Indian pastry of meat or vegetables" , "Triangular Indian turnover" , "Stuffed Indian pastry" , "Savoury Indian snack" .)
