It's the gap modified for Italian course? (9)
I believe the answer is:
spaghetti
'italian course?' is the definition.
(I know this)
'it's the gap modified' is the wordplay.
'modified' indicates an anagram.
'its'+'the'+'gap'='itsthegap'
'itsthegap' anagrammed gives 'SPAGHETTI'.
'for' is the link.
(Other definitions for spaghetti that I've seen before include "something resembling tangled wires" , "Stringed pasta" , "Strange tight peas for the Italian dish" , "Common form of pasta" , "something to eat" .)