In a special train, do nothing but Indian cooking (8)
I believe the answer is:
tandoori
'indian cooking' is the definition.
(type of Indian cooking)
'in a special train do nothing' is the wordplay.
'in' is an insertion indicator.
'a special' is an anagram indicator.
'nothing' becomes 'o' (looks like zero - 0).
'train' anagrammed gives 'tanri'.
'do'+'o'='doo'
'tanri' placed around 'doo' is 'TANDOORI'.
'but' acts as a link.
(Other definitions for tandoori that I've seen before include "Indian style of cooking" , "Tornado I found in Indian food" , "Clay oven cooking style" , "Clay-oven cookery" , "Type of Indian cooking" .)