Origins of Agni and Nandi (part human Indian god) (7)

'indian god' is the definition.
'Hanuman' can be an answer for 'god' (Hanuman is an example). I am not sure about the 'indian' bit.

'origins of agni and nandi part human' is the wordplay.
'origins of' says to take the initial letters.
'and' is a charade indicator (letters next to each other).
'nandi' becomes 'n' (this might be a standard abbreviation I've not previously seen).
'part' means one lot of letters goes inside another (the inserted letters split open or part the word).
The initial letter of 'agni' is 'a'.
'a'+'n'='an'
'an' going inside 'human' is 'HANUMAN'.

Can you help me to learn more?