Baltic city into cooking pasta (8)
I believe the answer is:
rigatoni
'pasta' is the definition.
(I know that rigatoni is a type of pasta)
'baltic city into cooking' is the wordplay.
'baltic city' becomes 'riga' (capital of Latvia, a Baltic state).
'cooking' indicates an anagram (letters cooked up into a new form).
'into' is an anagram of 'toni'.
'riga'+'toni'='RIGATONI'
(Other definitions for rigatoni that I've seen before include "Foodstuff" , "Short fluted tubes of pasta" , "Form of pasta" , "Pasta; at origin (anag.)" , "Short, ribbed, tubular pasta" .)