Some have chosen gas alternative, on the contrary, to produce Italian dish (7)
I believe the answer is:
lasagne
'italian dish' is the definition.
(I've seen this before)
'some have chosen gas alternative on the contrary' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'on the contrary' shows that the letters should be reversed in order (letters in the opposite or contrary direction).
'engasal' is hidden within 'have chosen gas alternative'.
'engasal' backwards is 'LASAGNE'.
'to produce' is the link.
(Other definitions for lasagne that I've seen before include "Sheet pasta" , "Fool ran as angel (anag) - pasta dish" , "Italian cooking" , "Flat sheets of pasta" , "It. dish of pasta, meat and sauce" .)