Green Italian sauce (5)
I believe the answer is:
pesto
'green italian sauce' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pesto that I've seen before include "Sauce of basil, pine nuts and garlic" , "Pasta sauce based on basil" , "Saucy work" , "Pasta sauce mainly of basil and cheese" , "Sauce of basil, pine nuts, etc" .)