Ecstasy! Pasta with no odd leek sauce (9)
I believe the answer is:
espagnole
'ecstasy pasta' is the definition.
The definition suggests a singular noun which matches the answer.
'with no odd leek sauce' is the wordplay.
'with' means one lot of letters goes inside another.
'no odd leek' becomes 'g' (I can't justify this - if you can you should give a lot more credence to this answer).
'sauce' becomes 'espanole' (espanole is a kind of sauce).
'g' inserted within 'espanole' is 'ESPAGNOLE'.
Can you help me to learn more?
(Another definition for espagnole that I've seen is " sauce".)