Firstly, bring in recipe young assistant needs if making rice dish (7)
I believe the answer is:
biryani
'rice dish' is the definition.
'biryani' can be an answer for 'dish' (I have seen 'Indian dish ' mean 'biryani' so perhaps 'dish' could also mean 'biryani'). I am not sure about the 'rice' bit.
'firstly bring in recipe young assistant needs if' is the wordplay.
'firstly' says to take the initial letters.
The initial letters of 'bring in recipe young assistant needs if' is 'BIRYANI'.
'making' is the link.
Can you help me to learn more?
(Other definitions for biryani that I've seen before include "Dish from India" , "Spicy dish" , "Indian dish; airy bin (anag.)" .)