Leading gastronome raises negative vote on cold/hot Italian dish (7)
I believe the answer is:
gnocchi
'italian dish' is the definition.
(I've seen this before)
'leading gastronome raises negative vote on coldhot' is the wordplay.
I cannot quite see how this works, but
'negative' could be 'no' (no is a kind of negative) and 'no' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for gnocchi that I've seen before include "Small Italian dumplings similar to pasta" , "A course in Rome" , "Starchy food" , "Dumpling dish" , "Italian potato dumplings" .)