Dish made with rava, one that could substitute another with oil sprinkled (7)
I believe the answer is:
ravioli
'dish made with rava one that could substitute' is the definition.
'ravioli' can be an answer for 'dish' (I've seen this before). I am unsure of the rest of the definition.
'another with oil sprinkled' is the wordplay.
'another with' becomes 'ravi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sprinkled' is an anagram indicator (the letters are sprinkled around).
'oil' with letters rearranged gives 'oli'.
'ravi'+'oli'='RAVIOLI'
Can you help me to learn more?
(Other definitions for ravioli that I've seen before include "Pasta resembling pillowcases" , "Filled pasta squares" , "Stuffed pasta squares" , "Small pasta cases with savoury fillings" , "Filled type of pasta" .)