Pasta is to come down in price (8)

'pasta' is the definition.
(I know that Farfalle is a type of pasta)

'come down in price' is the wordplay.
'come' becomes 'fall' (synonyms).
'down in' is an insertion indicator.
'price' becomes 'fare' (I have seen 'Price of passage ' mean 'fare' so perhaps 'price' could also mean 'fare').
'fall' inserted inside 'fare' is 'FARFALLE'.

'is to' is the link.