Pasta sauce add-in (7)
I believe the answer is:
oregano
'pasta sauce add-in' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oregano that I've seen before include "Herb - a no-goer (anag)" , "food flavouring" , "Herb used in cookery" , "Pizza herb" , "aromatic plant" .)