Italian staple food (5)
I believe the answer is:
pasta
'italian staple food' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pasta that I've seen before include "eg Macaroni" , "Dried flour paste used in cooking Italian dishes" , "shells, perhaps" , "Eg, spaghetti" , "Italian foodstuff" .)