Italian sauce made with crushed basil leaves, pine nuts and Parmesan cheese (5)

I believe the answer is:

pesto

(Other definitions for pesto that I've seen before include "Pasta sauce based on basil" , "A sauce served with pasta" , "Sauce of basil, pine nuts and garlic" , "Green sauce" , "Ligurian food" .)

I've seen this clue in The Guardian.

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