Italian serving seconds: crackers at eight (9)
I believe the answer is:
spaghetti
'italian serving' is the definition.
(type of pasta)
'seconds crackers at eight' is the wordplay.
'seconds' becomes 'sp' (I can't explain this - if you can you should give a lot more credence to this answer).
'crackers' indicates anagramming the letters (informal term for mad).
'at'+'eight'='ateight'
'ateight' anagrammed gives 'aghetti'.
'sp'+'aghetti'='SPAGHETTI'
Can you help me to learn more?
(Other definitions for spaghetti that I've seen before include "meal" , "Pasta in the form of long strings" , "A dish from the gas-pit" , "Pasta - Birmingham junction" , "Variety of pasta" .)